Addon Test: Fix indexing behavior

[yannbf]

Closes #

What I did

• filter mdx files without setting the test.exclude, because that causes us to remove all vitest's default.
• ignore test.includefrom the user, and log a warning prompting them to remove it from the config

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-storybook/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>

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initTime	13.8s	12.1s	-1s -718ms	-1.04	-14.1%
buildTime	8s	9.6s	1.6s	0.7	16.7%
testBuildTime	0ms	0ms	0ms	-	-
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devManagerIndexVisible	607ms	537ms	-70ms	-1.16	-13%
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Greptile Summary

Here's my expert review of the pull request:

Changes the indexing behavior in Storybook's test addon to use the stories field from .storybook/main.js instead of Vitest's test.include option, ensuring consistent story indexing between Storybook and Vitest.

• Added warning message in code/addons/test/src/vitest-plugin/index.ts when test.include is used
• Removed support for Vitest's test.include option in favor of Storybook's stories field
• Updated MIGRATION.md to document the deprecation of test.include configuration
• Simplified story file filtering by combining MDX exclusion with initial file selection
• Added dependencies (picocolors, ts-dedent) for warning message formatting

[greptile-apps]

LGTM

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