ESM: Ability to generate ESM-only for select entrypoints in core

[ndelangen]

What I did

I made a step towards ESM-only.

• The core package now only generates ESM for cli/bin & cli/index entrypoints.

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

• stories
• unit tests
• integration tests
• end-to-end tests

Manual testing

This section is mandatory for all contributions. If you believe no manual test is necessary, please state so explicitly. Thanks!

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Checklist for Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli/src/sandbox-templates.ts

• Make sure this PR contains one of the labels below:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
  • documentation: Documentation only changes. Will not show up in release changelog.
  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

🦋 Canary release

This PR does not have a canary release associated. You can request a canary release of this pull request by mentioning the @storybookjs/core team here.

core team members can create a canary release here or locally with gh workflow run --repo storybookjs/storybook canary-release-pr.yml --field pr=<PR_NUMBER>

name	before	after	diff	z	%
createSize	0 B	0 B	0 B	-	-
generateSize	77.7 MB	77.7 MB	720 B	-0.71	0%
initSize	146 MB	145 MB	-783 kB	-2.95	-0.5%
diffSize	68.5 MB	67.7 MB	-784 kB	-5.67	-1.2%
buildSize	7.1 MB	7.1 MB	-209 B	0.71	0%
buildSbAddonsSize	1.79 MB	1.79 MB	-51 B	0.71	0%
buildSbCommonSize	195 kB	195 kB	0 B	-	0%
buildSbManagerSize	1.85 MB	1.85 MB	-123 B	0.69	0%
buildSbPreviewSize	271 kB	271 kB	-17 B	0.67	0%
buildStaticSize	0 B	0 B	0 B	-	-
buildPrebuildSize	4.1 MB	4.1 MB	-191 B	0.71	0%
buildPreviewSize	3 MB	3 MB	-18 B	0.69	0%
testBuildSize	0 B	0 B	0 B	-	-
testBuildSbAddonsSize	0 B	0 B	0 B	-	-
testBuildSbCommonSize	0 B	0 B	0 B	-	-
testBuildSbManagerSize	0 B	0 B	0 B	-	-
testBuildSbPreviewSize	0 B	0 B	0 B	-	-
testBuildStaticSize	0 B	0 B	0 B	-	-
testBuildPrebuildSize	0 B	0 B	0 B	-	-
testBuildPreviewSize	0 B	0 B	0 B	-	-

name	before	after	diff	z	%
createTime	8.8s	19.4s	10.5s	11.16	🔺54.2%
generateTime	20.8s	26.5s	5.7s	2.3	🔺21.5%
initTime	13.5s	17s	3.4s	4.81	🔺20.6%
buildTime	9.5s	8.5s	-982ms	-0.34	-11.5%
testBuildTime	0ms	0ms	0ms	-	-
devPreviewResponsive	7.6s	7s	-554ms	-1.95	🔰-7.8%
devManagerResponsive	5.3s	4.8s	-471ms	-1.22	-9.7%
devManagerHeaderVisible	674ms	761ms	87ms	0.23	11.4%
devManagerIndexVisible	742ms	809ms	67ms	-0.06	8.3%
devStoryVisibleUncached	1.2s	1.2s	-59ms	-1.95	-4.9%
devStoryVisible	706ms	807ms	101ms	0.32	12.5%
devAutodocsVisible	592ms	703ms	111ms	2.32	🔺15.8%
devMDXVisible	588ms	660ms	72ms	0.54	10.9%
buildManagerHeaderVisible	670ms	675ms	5ms	-0.21	0.7%
buildManagerIndexVisible	686ms	693ms	7ms	0.09	1%
buildStoryVisible	668ms	679ms	11ms	-0.7	1.6%
buildAutodocsVisible	572ms	596ms	24ms	0.47	4%
buildMDXVisible	564ms	636ms	72ms	1.98	🔺11.3%

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