Remove dead code from Notifications

[kean]

To the best of my knowledge, the code that displays comments in NotificationDetailsViewController is also dead. The app has been using NotificationCommentDetailViewController with its underlying CommentDetailViewController for a while now instead.

To test:

Regression Notes

1. Potential unintended areas of impact

2. What I did to test those areas of impact (or what existing automated tests I relied on)

3. What automated tests I added (or what prevented me from doing so)

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding unit tests for my changes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

Testing checklist:

• WordPress.com sites and self-hosted Jetpack sites.
• Portrait and landscape orientations.
• Light and dark modes.
• Fonts: Larger, smaller and bold text.
• High contrast.
• VoiceOver.
• Languages with large words or with letters/accents not frequently used in English.
• Right-to-left languages. (Even if translation isn’t complete, formatting should still respect the right-to-left layout)
• iPhone and iPad.
• Multi-tasking: Split view and Slide over. (iPad)

[dangermattic]

	1 Warning
⚠️	This PR is larger than 500 lines of changes. Please consider splitting it into smaller PRs for easier and faster reviews.

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[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress Alpha by scanning the QR code below to install the corresponding build.

	App Name	WordPress Alpha
	Configuration	Release-Alpha
	Build Number	pr24104-a9adaff
	Version	25.7.1
	Bundle ID	org.wordpress.alpha
	Commit	a9adaff
	App Center Build	WPiOS - One-Offs #11533

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[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack Alpha by scanning the QR code below to install the corresponding build.

	App Name	Jetpack Alpha
	Configuration	Release-Alpha
	Build Number	pr24104-a9adaff
	Version	25.7.1
	Bundle ID	com.jetpack.alpha
	Commit	a9adaff
	App Center Build	jetpack-installable-builds #10565

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.

[crazytonyli]

Is this variable always false? If not, replyTextView may appear in the UI and is now removed from this PR.

[crazytonyli]

I'm not sure what's going on here. Do we just not handle these two kinds of content, and let if fall to the default case and use the a default cell?

[kean]

It's a good point. This code is extremely hard to follow because it's parsing notification payload returned by the server. I'd suggest that instead of removing this code right away, let's add wpAssertionFailure in every code path we think can be removed, and then remove the code only when we are confident it's dead.