Addon Test: Clarify message when vitest detects missing deps

[ndelangen]

Closes #29721

What I did

• Modify the message from vitest to make the need to install some missing dependencies

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

• Set up a sandbox with the test addon
• Neglect to install a coverage provider (v8 or instanbul)
• Run a storybook in dev-mode
• Configure (in the UI) to have the test addon run coverage
• Run tests from within the UI

You should see a Crash appear in the storybook UI, which then should let you open a modal.
This modal should tell you to install the provider package.
The CLI should also tell you to install the package.

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>

name	before	after	diff	z	%
createSize	0 B	0 B	0 B	-	-
generateSize	77.7 MB	77.7 MB	2.5 kB	1.61	0%
initSize	130 MB	130 MB	2.5 kB	-1	0%
diffSize	52.4 MB	52.4 MB	0 B	-1	0%
buildSize	6.83 MB	6.83 MB	0 B	1.1	0%
buildSbAddonsSize	1.51 MB	1.51 MB	0 B	-0.74	0%
buildSbCommonSize	195 kB	195 kB	0 B	-	0%
buildSbManagerSize	1.86 MB	1.86 MB	0 B	1.21	0%
buildSbPreviewSize	271 kB	271 kB	0 B	-1.11	0%
buildStaticSize	0 B	0 B	0 B	-	-
buildPrebuildSize	3.84 MB	3.84 MB	0 B	1.19	0%
buildPreviewSize	3 MB	3 MB	0 B	1	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	7s	19.8s	12.7s	0.76	64.3%
generateTime	22.7s	24.2s	1.4s	0.17	6.1%
initTime	15.8s	16.3s	546ms	0.04	3.3%
buildTime	9s	8.2s	-790ms	-0.8	-9.6%
testBuildTime	0ms	0ms	0ms	-	-
devPreviewResponsive	4.8s	6.8s	2s	2.59	🔺29.4%
devManagerResponsive	3.4s	4.7s	1.2s	5.58	🔺27.1%
devManagerHeaderVisible	590ms	856ms	266ms	5.21	🔺31.1%
devManagerIndexVisible	590ms	905ms	315ms	5.5	🔺34.8%
devStoryVisibleUncached	1.8s	2.4s	640ms	2.66	🔺26.1%
devStoryVisible	748ms	893ms	145ms	4.25	🔺16.2%
devAutodocsVisible	548ms	763ms	215ms	4.06	🔺28.2%
devMDXVisible	497ms	799ms	302ms	5.12	🔺37.8%
buildManagerHeaderVisible	566ms	838ms	272ms	4.1	🔺32.5%
buildManagerIndexVisible	577ms	872ms	295ms	4.27	🔺33.8%
buildStoryVisible	560ms	836ms	276ms	4.35	🔺33%
buildAutodocsVisible	465ms	645ms	180ms	4.27	🔺27.9%
buildMDXVisible	562ms	657ms	95ms	3.01	🔺14.5%

Greptile Summary

This PR improves error handling for missing Vitest coverage dependencies in the Storybook test addon by providing clearer user guidance.

• Fixed error detection in test-manager.ts to properly identify missing coverage packages (@vitest/coverage-v8 or @vitest/coverage-istanbul)
• Added specific error messages in vitest-manager.ts to guide users on installing required coverage packages
• Fixed typo in error condition check (e.mesaage -> e.message) in test-manager.ts
• Removed debug console.log('HELLO') statement in vitest-manager.ts

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