fix(comments): enforce Core parity for spam and trash row actions.

[KarunyaChavan]

This PR fixes the action button mismatch in the native Comments window by aligning the available actions for "spam" and "trash" comments with WordPress Core's class-wp-comments-list-table.php.

Closes #918

Why?

The original App Framework port of the comments window unintentionally omitted the status guards on row actions. This led to a few UX and logical bugs:

• Incoherent Actions: Users could attempt to "Reply" to or "Edit" a quarantined comment, which doesn't make sense since they cannot be publicly displayed until restored.
• Destructive Fallback: Spammed or trashed comments showed "Approve" instead of "Not Spam" or "Restore". Clicking "Approve" bypassed the moderation queue and permanently deleted the comment's previous state, forcing it immediately live.
• Missing Workflows: The standard restorative actions were completely absent from the UI.

What Changed?

Tab	Before	After
Spam
Trash

• Replaced "Approve" for quarantined comments:
  • In the Spam tab, "Approve" is replaced with "Not Spam" (routes to wp_unspam_comment).
  • In the Trash tab, "Approve" is replaced with "Restore" (routes to wp_untrash_comment).
• Suppressed "Reply" and "Edit" for quarantined comments:
  • Introduced an isQuarantined flag (status === 'spam' || status === 'trash'). If true, the Reply and Edit buttons are hidden, mirroring Core's exact guard.
• Preserved "Trash" on spam rows:
  • Left the "Trash" button visible on spam rows so users can still route spam into the Recycle Bin for eventual permanent deletion (as OpenStation deliberately avoids direct permanent deletion in this window).
• Added Test Coverage:
  • Added missing Vitest coverage to assert the exact action sets rendered for spam and trash statuses.
  • Added dispatch tests to verify that unspam and untrash fire correctly without requiring confirmation dialogs.

Steps for Testing

• Toggle ON "Use the native Comments Window" in Settings.
• Open the Comments app and move at least two comments to Spam and two to Trash.
• Switch to the Spam tab. Verify that:
  • The actions shown are Not Spam and Trash.
  • Approve, Reply, and Edit are NOT visible.
  • Clicking Not Spam successfully restores the comment without a confirmation dialog.
• Switch to the Trash tab. Verify that:
  • The actions shown are Restore and Spam.
  • Approve, Reply, Edit, and Trash are NOT visible.
  • Clicking Restore successfully moves the comment back to its previous state without a confirmation dialog.