ci: disable test jobs, Snyk, and remove @vitest/coverage-v8#556

Copilot wants to merge 2 commits intodependabot/npm_and_yarn/Cyrano/vitest/coverage-v8-4.1.0MightyPrytanis/codebase:dependabot/npm_and_yarn/Cyrano/vitest/coverage-v8-4.1.0from

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