feat: always enable ESM loader with the new API

[dgozman]

It does not require a process restart anymore, so safe to enable.

Fixes #29747.

[github-actions]

Test results for "tests 1"

6 flaky

⚠️ [chromium-library] › library/tracing.spec.ts:243:5 › should not include trace resources from the previous chunks
⚠️ [chromium-page] › page/interception.spec.ts:104:3 › should intercept network activity from worker
⚠️ [chromium-library] › library/tracing.spec.ts:243:5 › should not include trace resources from the previous chunks
⚠️ [firefox-library] › library/tracing.spec.ts:243:5 › should not include trace resources from the previous chunks
⚠️ [firefox-page] › page/frame-goto.spec.ts:46:3 › should continue after client redirect
⚠️ [webkit-library] › library/tracing.spec.ts:243:5 › should not include trace resources from the previous chunks

26822 passed, 620 skipped
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Merge workflow run.