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	78.7 MB	78.7 MB	0 B	-	0%
initSize	147 MB	146 MB	-782 kB	-Infinity	-0.5%
diffSize	68.3 MB	67.5 MB	-782 kB	-Infinity	-1.2%
buildSize	6.79 MB	6.79 MB	0 B	-	0%
buildSbAddonsSize	1.5 MB	1.5 MB	0 B	-	0%
buildSbCommonSize	195 kB	195 kB	0 B	-	0%
buildSbManagerSize	1.83 MB	1.83 MB	0 B	-	0%
buildSbPreviewSize	270 kB	270 kB	0 B	-	0%
buildStaticSize	0 B	0 B	0 B	-	-
buildPrebuildSize	3.8 MB	3.8 MB	0 B	-	0%
buildPreviewSize	2.99 MB	2.99 MB	0 B	-	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	7.1s	5.2s	-1s -818ms	-Infinity	🔰-34.4%
generateTime	24.9s	18.3s	-6s -637ms	-Infinity	🔰-36.2%
initTime	14.9s	11.9s	-2s -930ms	-Infinity	🔰-24.4%
buildTime	7.8s	9.4s	1.6s	Infinity	🔺17.4%
testBuildTime	0ms	0ms	0ms	-	-
devPreviewResponsive	7.2s	6.1s	-1s -58ms	-Infinity	🔰-17.2%
devManagerResponsive	4.8s	3.8s	-1s	-Infinity	🔰-26.1%
devManagerHeaderVisible	768ms	677ms	-91ms	-Infinity	🔰-13.4%
devManagerIndexVisible	813ms	705ms	-108ms	-Infinity	🔰-15.3%
devStoryVisibleUncached	1.2s	871ms	-414ms	-Infinity	🔰-47.5%
devStoryVisible	811ms	703ms	-108ms	-Infinity	🔰-15.4%
devAutodocsVisible	574ms	579ms	5ms	Infinity	0.9%
devMDXVisible	608ms	560ms	-48ms	-Infinity	🔰-8.6%
buildManagerHeaderVisible	658ms	539ms	-119ms	-Infinity	🔰-22.1%
buildManagerIndexVisible	661ms	542ms	-119ms	-Infinity	🔰-22%
buildStoryVisible	695ms	589ms	-106ms	-Infinity	🔰-18%
buildAutodocsVisible	587ms	513ms	-74ms	-Infinity	🔰-14.4%
buildMDXVisible	511ms	581ms	70ms	Infinity	🔺12%

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