Telemetry: Add globals stats

[shilman]

Part of #27210

What I did

• Track usage of the new globals annotation
• Add test
• Update telemetry docs

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

Add a globals story, run with STORYBOOK_TELEMETRY_DEBUG=1, and verify that the story is logged in payload.stats.

🦋 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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Greptile Summary

The pull request adds telemetry tracking for the new globals annotation, including updates to tests and documentation.

• code/core/src/core-server/utils/StoryIndexGenerator.test.ts: Added globals field to stats object in test cases to track globals annotation usage.
• code/core/src/csf-tools/CsfFile.test.ts: Updated test cases to include checks for globals property in story statistics.
• code/core/src/csf-tools/CsfFile.ts: Included globals in the list of tracked annotations in the __stats object.
• code/core/src/types/modules/indexer.ts: Added globals property to IndexInputStats interface for telemetry purposes.
• docs/configure/telemetry.mdx: Documented new telemetry data collection for globals annotation.

[greptile-apps]

LGTM

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