chore: convert icons to a compiled package and convert tests to vitest

[AtofStryker]

• Closes

Additional details

Converts @packages/icons to use vitest and removes the ts-node entrypoint making ESM possible

Steps to test

How has the user experience changed?

PR Tasks

• Have tests been added/updated?
• Has a PR for user-facing changes been opened in cypress-documentation?
• Have API changes been updated in the type definitions?

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Note

Convert @packages/icons to a compiled package with CJS/ESM builds, replace Mocha/Chai tests with Vitest, and update CI/docs accordingly.

• @packages/icons:
  • Build: Replace ts-node with tsx; add build:cjs/build:esm via tsc with new tsconfig.cjs.json/tsconfig.esm.json and shared tsconfig.base.json; set types and keep index.js/index.d.ts entrypoints; update .gitignore/.eslintignore.
  • Source: Adjust dist path resolution in index.ts to __dirname/dist.
  • Testing: Migrate from Mocha/Chai to Vitest (vitest.config.ts); replace test/icons_spec.ts with test/icons.spec.ts.
  • Deps/Scripts: Add vitest and tsx; update scripts (build, build-assets, test-unit, check-ts).
• CI: Decrease sanitize-verify-and-store-mocha-results expectedResultCount from 10 to 9 in unit tests.
• Docs: Update guides/esm-migration.md checklist (mark packages/icons complete; adjust https-proxy entries).
• Lockfile: Reflect new deps (vitest, tsx) and cleanup mocha range.

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[cypress]

cypress    Run #66160

Run Properties:   Passed #66160  •  27aa98a6c4: chore: make icons builds from source and remove ts-node entry point to make ESM ...

Project	cypress
Branch Review	chore/icons_vitest
Run status	Passed #66160
Run duration	22m 50s
Commit	27aa98a6c4: chore: make icons builds from source and remove ts-node entry point to make ESM ...
Committer	Bill Glesias
View all properties for this run ↗︎

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Test results
Failures	0
Flaky	13
Pending	1102
Skipped	0
Passing	26661
View all changes introduced in this branch ↗︎

UI Coverage  45.11%
Untested elements	186
Tested elements	157

Accessibility  97.76%
Failed rules	4 critical   8 serious   2 moderate   2 minor
Failed elements	110