Replace branch deletion picker with a modal dialog

[Copilot]

Branch deletion uses a searchable multi-select picker for a small set of cleanup actions. Replace it with the requested modal dialog and concise buttons.

• Dialog: Show available actions as buttons; move branch names, repository details, and worktree paths into the detail text.
• Combined cleanup: Add “Delete All” when multiple deletion actions are available. Keep Codespace suspension separate.
• Behavior: Preserve cancellation and action-availability safeguards. Leave automatic cleanup unchanged and clarify the preference descriptions.

• Fixes Better UX for choosing branch delete options #8932

[azure-pipelines]

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[Copilot]

🟢 Approval recommended

The reviewed changes preserve safeguards and include updated test coverage.

Pull request overview

Replaces the branch-deletion picker with a modal action dialog while preserving cleanup safeguards.

Changes:

• Adds concise cleanup actions, details, and “Delete All” handling.
• Updates deletion replies and state propagation.
• Clarifies preferences and expands coverage.

File summaries

File	Summary
webviews/common/context.tsx	Handles deletion replies and state updates.
src/test/github/pullRequestOverview.test.ts	Tests modal and reply behavior.
src/test/github/folderRepositoryManager.test.ts	Tests cleanup action combinations and safeguards.
src/github/pullRequestReviewCommon.ts	Implements modal cleanup actions.
src/github/pullRequestOverview.ts	Replies with deletion results and refreshes the panel.
src/github/activityBarViewProvider.ts	Uses reply-based deletion handling.
package.nls.json	Clarifies cleanup preference descriptions.

Review details

• Files reviewed: 7/7 changed files
• Comments generated: 0
• Review effort level: Lite

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