CSF: Rename preview.js globals to initialGlobals

[shilman]

Closes N/A

What I did

CSF updates to implement Story globals per #23347 (comment)

• Add preview.js initialGlobals to replace globals
• Deprecate preview.js globals
• Add globals to component/story annotations
• Add automigration
• Add MIGRATION.md notes
• Bugfix for ConfigFile.removeField common case

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

0. Build this branch
1. Create a sandbox or a random storybook project
2. Add a globals annotation to preview.js
3. Verify that the initial value of globals are set correctly and a deprecation warning is shown
4. In the project directory run: /path/to/code/lib/cli/bin/index.js automigrate initial-globals
5. Verify that the prompts make sense and that preview.js has been updated to initialGlobals
6. Verify that the initial value of globals are still set correctly

Documentation

Interestingly, could not find globals documented on https://storybook.js.org/docs/get-started cc @kylegach

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

🦋 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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[tmeasday]

Can I get a test on normalizeProjectAnnotations please?

[shilman]

Self-merging @tmeasday