Core: Add experimental_TEST_PROVIDER addon type

[ghengeveld]

Closes #29092

What I did

This adds a new addon type experimental_TEST_PROVIDER. It takes a title, icon and description which will eventually (in another PR) be displayed in the Testing Module in the sidebar.

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	77.3 MB	77.3 MB	76 B	0.95	0%
initSize	162 MB	162 MB	-4.51 kB	1.02	0%
diffSize	84.9 MB	84.9 MB	-4.58 kB	0.91	0%
buildSize	7.53 MB	7.52 MB	-12.7 kB	0.38	-0.2%
buildSbAddonsSize	1.62 MB	1.62 MB	-102 B	0.53	0%
buildSbCommonSize	195 kB	195 kB	0 B	-	0%
buildSbManagerSize	2.34 MB	2.34 MB	49 B	0.58	0%
buildSbPreviewSize	352 kB	352 kB	-18 B	1.34	0%
buildStaticSize	0 B	0 B	0 B	-	-
buildPrebuildSize	4.51 MB	4.51 MB	-71 B	0.58	0%
buildPreviewSize	3.02 MB	3.01 MB	-12.7 kB	-0.17	-0.4%
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	11.5s	4.4s	-0.38	38.4%
generateTime	21.5s	33.5s	11.9s	8.29	🔺35.8%
initTime	17.2s	29.9s	12.7s	9.06	🔺42.4%
buildTime	11.7s	14.7s	2.9s	1.36	🔺19.9%
testBuildTime	0ms	0ms	0ms	-	-
devPreviewResponsive	6.5s	8.3s	1.8s	1.75	🔺21.9%
devManagerResponsive	4s	5.5s	1.4s	2.1	🔺25.9%
devManagerHeaderVisible	786ms	1s	215ms	1.65	🔺21.5%
devManagerIndexVisible	837ms	1s	209ms	1.63	🔺20%
devStoryVisibleUncached	1.4s	1.7s	268ms	1.15	15.6%
devStoryVisible	838ms	1s	210ms	1.64	🔺20%
devAutodocsVisible	634ms	916ms	282ms	1.83	🔺30.8%
devMDXVisible	663ms	959ms	296ms	2.39	🔺30.9%
buildManagerHeaderVisible	645ms	939ms	294ms	2.28	🔺31.3%
buildManagerIndexVisible	652ms	941ms	289ms	1.73	🔺30.7%
buildStoryVisible	708ms	1s	320ms	2.45	🔺31.1%
buildAutodocsVisible	629ms	835ms	206ms	1.25	🔺24.7%
buildMDXVisible	608ms	841ms	233ms	2.31	🔺27.7%

Greptile Summary

This PR introduces a new experimental addon type called TEST_PROVIDER to Storybook, aimed at implementing a Test Provider API for displaying test-related information in the sidebar.

• Added experimental_TEST_PROVIDER to Addon_TypesEnum in code/core/src/types/modules/addons.ts
• Introduced Addon_TestProviderType interface defining structure for test provider addons
• Updated AddonStore class in code/core/src/manager-api/lib/addons.ts to support the new addon type
• Extended getElements and add methods in AddonStore to accommodate TEST_PROVIDER
• Prepared groundwork for future implementation of test information display in the sidebar

[greptile-apps]

LGTM

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