Migrate to Deno and Remove react and deskpro-ui to slimline the app-sdk

[HappyPaul55]

This pull request introduces significant changes to the project, including migrating the build system to Deno, simplifying workflows, better typings for Context, more tests, removal of Deskpro UI and React (What this means is that the app-sdk is just that and nothing more. We will move the React-ness into app-sdk-react so that there is still 1st class React support.) and removing legacy configurations and dependencies. The most important updates include the adoption of Deno for development and builds, streamlining CI/CD workflows, and removing unused files and configurations related to Babel, ESLint, Storybook, and legacy styles.

Migration to Deno:

• Added deno.json to configure the Deno project with tasks, imports, and exports for the SDK. This includes a new build task and dependency management.
• Updated README.md to reflect the transition to Deno, including instructions for using deno test. Removed references to UI component development and Storybook. [1] [2]
• Introduced .vscode/settings.json to enable Deno-specific settings in the development environment.

Workflow Simplification:

• Replaced the main.yaml and pr_build.yml workflows with a modular subworkflow-build.yml, which consolidates linting, testing, building, and tagging into a single reusable workflow. The new workflows also support merge queues and concurrency controls. [1] [2] [3]

Removal of Legacy Configurations:

• Removed .babelrc, .editorconfig, .eslintrc.js, and other configuration files related to Babel, ESLint, and editor settings, as they are no longer required with the Deno migration. [1] [2] [3]
• Deleted Storybook configuration files (.storybook/main.ts, .storybook/preview.tsx, .storybook/structure/*) and references to Storybook in the documentation, as Storybook is no longer part of the project. [1] [2] [3] [4]

Dependency and Feature Updates:

• Updated .devcontainer/devcontainer.json to replace pnpm with Deno-specific setup commands and added support for the Deno VS Code extension. [1] [2]

Cleanup:

• Removed unused SCSS files (deskpro.scss) and references to legacy styles.

[Copilot]

Pull Request Overview

This PR removes React and Deskpro UI assets from the core App SDK to slim it down while adding native Deno support and updating documentation. Key changes include:

• Removal of various React‐specific files and configuration files (Storybook, Babel, ESLint, SCSS, etc.)
• Addition of deno.json and shell installation script for Deno
• Updates to documentation (README.md) to reflect the migration of UI components to a separate package

Reviewed Changes

Copilot reviewed 373 out of 373 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
docs/storybook/assets/CopyToClipboardInput-3d8bb04a.js	Removed outdated React Storybook asset
docs/storybook/assets/Color-YHDXOIA2-04c9e855.js	Removed React Storybook asset
docs/index.html	Removed legacy documentation HTML
deskpro.scss	Removed SCSS styles no longer used
deno.json	Added Deno configuration
a	Added/upgraded shell installation script for Deno support
README.md	Updated documentation to include Deno & UI migration notes
.storybook/*	Removed Storybook structure and preview files
.eslintrc.js, .babelrc, .editorconfig	Removed configuration files associated with removed tooling
.devcontainer/devcontainer.json	Updated container configuration to use a different base image and install Deno
.github/workflows/*	Updated and added workflows to support the new deno-centric build process

Comments suppressed due to low confidence (2)

README.md:110

• Consider adding a note to clearly indicate that React-specific components have been migrated to a separate package (e.g., '@deskpro/app-sdk-react') to avoid confusion for consumers of the core SDK.

The Apps SDK doesn't export any UI elements but for consistency, we recommended you use [Deskpro UI](https://github.com/deskpro/deskpro-product/tree/master/packages/deskpro-ui).

.devcontainer/devcontainer.json:19

• Using 'curl | sh' to install Deno can be risky. Consider verifying the installation script's integrity (e.g., via a checksum) before execution.

  "onCreateCommand": "curl -fsSL https://deno.land/x/install/install.sh | sh -s -- --yes && . \"/home/vscode/.deno/env\""

[Copilot]

Pull Request Overview

This PR slims down the app-sdk by migrating to Deno, removing React/Deskpro UI and Storybook, and unifying CI/CD workflows.

• Migrate build, test, and lint tasks to Deno via deno.json and update documentation.
• Remove legacy UI assets, SCSS, Storybook configuration, and editor/linter configs.
• Consolidate GitHub workflows into a reusable Deno-based subworkflow.

Reviewed Changes

Copilot reviewed 383 out of 383 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
docs/storybook/assets/*.js	Removed generated Storybook asset files
docs/index.html	Deleted static docs homepage
deskpro.scss	Removed legacy SCSS imports
deno.json	Added Deno project configuration and build task
README.md	Updated installation and usage instructions for Deno
.github/workflows/subworkflow-build.yml	Introduced reusable Deno-based build workflow
.github/workflows/pr_build.yml	Switched PR build to call subworkflow
.github/workflows/main.yaml	Switched main build to call subworkflow
.vscode/settings.json	Added VS Code Deno extension settings
.storybook/**/*, .eslintrc.js, .babelrc, etc.	Deleted Storybook and legacy configuration files

Comments suppressed due to low confidence (3)

.github/workflows/pr_build.yml:18

• The contents: write and pull-requests: read fields are indented under secrets instead of a permissions: block. Introduce a permissions: key above them and adjust indentation accordingly.

      contents: write

.github/workflows/pr_build.yml:19

• This line should be nested under a permissions: section; currently it's misaligned under secrets and may be ignored by GitHub Actions.

      pull-requests: read

.github/workflows/main.yaml:20

• pull-requests: read is listed without a parent permissions: key; ensure both contents: and pull-requests: are defined under a permissions: block for correct workflow permissions.

      pull-requests: read