Linkify timeline event timestamps to match GitHub.com behavior

[Copilot]

Timeline event timestamps are now clickable links that navigate to the PR/issue page, matching the behavior shown on GitHub.com.

Changes Made

Updated 8 timeline event components in webviews/components/timeline.tsx to use the href prop on their Timestamp components:

• HeadDeleteEventView
• CrossReferencedEventView
• AssignUnassignEventView
• ClosedEventView
• ReopenedEventView
• CopilotStartedEventView
• CopilotFinishedEventView
• CopilotFinishedErrorEventView

Implementation

The fix leverages the existing Timestamp component's href prop functionality:

// Before:
<Timestamp date={event.createdAt} />

// After:
<Timestamp href={pr.url} date={event.createdAt} />

Each timeline event component now uses useContext(PullRequestContext) to access the PR URL and pass it to the timestamp component, making the timestamps clickable links that navigate to the PR/issue page.

Visual Changes

Timeline timestamps are now underlined and clickable, consistent with GitHub.com behavior:

The implementation is minimal and surgical, following the same pattern already used by MergedEventView and CommentBox components.

Fixes #7009.

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