feat: Rollup/Vite no longer uses unplugin

[timfish]

• Ref Remove unplugin dependency #861

This PR adds a regular (non-unplugin) Rollup plugin which is also used for Vite.

This involved core changes:

• Exporting more utilities from bundler-core
• Adding globFiles core export for reusable asset finding
• Rename generateGlobalInjectorCode to generateReleaseInjectorCode since that better describes what it does
• Removing all the Rollup specific code from core

Rollup plugin changes:

• Creating a new Rollup plugin that incorporates all the Rollup functionality
• Moving the Rollup renderChunk tests from core to Rollup
• Removed all the deps/references to unplugin

Note on test removal

This PR removes the disabled-sourcemaps-upload.test.ts‎ test, but all that did was check if a specific plugin was present.

I didn't re-add a test to check for upload because it's currently difficult to do with Jest and the logic is currently very clear:

• https://github.com/timfish/sentry-javascript-bundler-plugins/blob/0ab8602d59e34e888ded70be31fe332915b1582e/packages/rollup-plugin/src/index.ts#L68
• https://github.com/timfish/sentry-javascript-bundler-plugins/blob/0ab8602d59e34e888ded70be31fe332915b1582e/packages/rollup-plugin/src/index.ts#L187-L189

[github-actions]

Semver Impact of This PR

🟡 Minor (new features)

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New Features ✨

• Rollup/Vite no longer uses unplugin by timfish in #858

• Esbuild no longer uses unplugin by timfish in #871
• Webpack no longer uses unplugin by timfish in #870

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