Rename variable to match feature flag name: InsideDialog not InsidePortal

[Copilot]

Addresses review feedback from parent PR #7524 to rename featureFlagDisplayInViewportInsidePortal to featureFlagDisplayInViewportInsideDialog.

Changes

• Variable name now matches feature flag primer_react_action_menu_display_in_viewport_inside_dialog
• Accurately reflects that the feature detects ActionMenu inside Dialog, not Portal

Changelog

Changed

• Renamed featureFlagDisplayInViewportInsidePortal to featureFlagDisplayInViewportInsideDialog in ActionMenu.tsx

Rollout strategy

• None; variable rename only, no API or behavior changes

Testing & Reviewing

No functional changes. Variable rename only for consistency with feature flag naming.

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github-ui (Learn more about how to run integration tests)

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[changeset-bot]

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Latest commit: 7a37fe6

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[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github-ui depends on. If you are GitHub staff, test these changes with github/github-ui using the integration workflow. Or, apply the integration-tests: skipped manually label to skip these checks.