Optimize: Production-mode `react` in manager

[ndelangen]

Closes https://github.com/storybookjs/storybook/issues/29166

What I did

• [x] Set react in prod mode for the manager globals bundle
• [x] Bundle the metafiles outputted by esbuild for the core.

Before:

After:

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	77.5 MB	77.5 MB	659 B	1.21	0%
initSize	162 MB	162 MB	-372 kB	-3.83	-0.2%
diffSize	85 MB	84.6 MB	-373 kB	-23.62	-0.4%
buildSize	7.57 MB	7.19 MB	-384 kB	-29160.19	🔰-5.3%
buildSbAddonsSize	1.66 MB	1.66 MB	0 B	-	0%
buildSbCommonSize	195 kB	195 kB	0 B	-	0%
buildSbManagerSize	2.34 MB	1.96 MB	-384 kB	-42240.73	🔰-19.6%
buildSbPreviewSize	352 kB	352 kB	0 B	-	0%
buildStaticSize	0 B	0 B	0 B	-	-
buildPrebuildSize	4.55 MB	4.17 MB	-384 kB	-42240.73	🔰-9.2%
buildPreviewSize	3.02 MB	3.02 MB	0 B	-2.31	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	7.5s	18.5s	10.9s	0.72	59.3%
generateTime	25.3s	22.7s	-2s -599ms	0.16	-11.4%
initTime	22.7s	19.7s	-3s -11ms	0.8	-15.3%
buildTime	14.4s	11.3s	-3s -72ms	-0.1	-27%
testBuildTime	0ms	0ms	0ms	-	-
devPreviewResponsive	6.3s	6.3s	7ms	-1	0.1%
devManagerResponsive	4.2s	4.2s	5ms	-1.06	0.1%
devManagerHeaderVisible	758ms	552ms	-206ms	-2.42	🔰-37.3%
devManagerIndexVisible	800ms	594ms	-206ms	-2.18	🔰-34.7%
devStoryVisibleUncached	1.2s	1.1s	-68ms	-0.66	-5.8%
devStoryVisible	799ms	595ms	-204ms	-2.23	🔰-34.3%
devAutodocsVisible	661ms	381ms	-280ms	-2.46	🔰-73.5%
devMDXVisible	625ms	435ms	-190ms	-2.25	🔰-43.7%
buildManagerHeaderVisible	677ms	498ms	-179ms	-2.8	🔰-35.9%
buildManagerIndexVisible	678ms	501ms	-177ms	-2.85	🔰-35.3%
buildStoryVisible	738ms	578ms	-160ms	-2.43	🔰-27.7%
buildAutodocsVisible	617ms	451ms	-166ms	-2.78	🔰-36.8%
buildMDXVisible	624ms	509ms	-115ms	-1.74	🔰-22.6%

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[ndelangen]

I tested the react devtools, and the behavior seems unchanged