Addon Test: Show sub test provider toggle state in main testing module

[ghengeveld]

Closes #30009

What I did

Muted the disabled options and adds a (disabled) suffix:

While I was implementing this, I noticed a discrepancy in the color between the muted option and the description text above ("Starting..."). This prompted me to review what color variable was being used. I found a bunch of places where barTextColor was being used while textMutedColor is more appropriate (because it's not in a bar and the intent is muted text) so I've corrected those places as well.

Note that the color difference between defaultText and textMutedColor is pretty minimal, but I've verified these are the exact colors used in Figma.

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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testBuildTime	0ms	0ms	0ms	-	-
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buildMDXVisible	524ms	414ms	-110ms	-0.69	-26.6%

Greptile Summary

Here's my summary of the PR changes:

Improves visual feedback for disabled test providers and standardizes muted text colors across the UI components in Storybook's testing module.

• Added (disabled) suffix and muted text color for disabled test options in code/addons/test/src/components/TestProviderRender.tsx
• Replaced barTextColor with textMutedColor in multiple components for better semantic meaning and consistency
• Added new ItemTitle styled component to handle disabled state styling
• Updated ListItem component to use theme's textMutedColor directly instead of transparentized text
• Fixed color inconsistency between disabled options and description text in test provider UI

[greptile-apps]

LGTM

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