Improve logging output from Nimma when a custom function errors

[jimkidd2048]

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Describe the bug

when validating a yaml document the linting stops and following notification appears.

The spectral output channel has the following error:

[Error - 4:31:33 PM] An error occurred while validating document file:///xxxV1.yaml: AggregateError: Error running Nimma

It looks like the same issue was reported and corrected in the CLI repo: stoplightio/spectral#2053

Environment:

• Extension version: v1.1.2
• VS Code version:
  Version: 1.89.0 (user setup)
  Commit: b58957e67ee1e712cebf466b995adf4c5307b2bd
  Date: 2024-05-01T02:09:22.859Z
  Electron: 28.2.8
  ElectronBuildId: 27744544
  Chromium: 120.0.6099.291
  Node.js: 18.18.2
  V8: 12.0.267.19-electron.0
  OS: Windows_NT x64 10.0.19045
• Operating System: Windows 10