Introduce test-tools for esbuild config valiation.

[pablo-mayrgundter]

• Add unit test for esbuild to validate only production config gets checked in.

And some cleanup:

• Simplify common.js to just export the config instead of separate build step.
• Disable console logging during test.
• Remove analysis from regular runs but add new pkg script for it

Tested locally and verified in GH actions.

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[nickcastel50]

LGTM