[Notifications P2] Remove obsolete code

[alpavanoglu]

Description

Just a clean up for obsolete code. After merging the Comment Moderation PR, old moderation code became obsolete.

Testing Steps

Just an overall smoke test to the feature should work. No new functionality was added.

Regression Notes

1. Potential unintended areas of impact
   N/A

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

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

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)

[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	pr23268-3b25e66
	Version	24.8
	Bundle ID	org.wordpress.alpha
	Commit	3b25e66
	App Center Build	WPiOS - One-Offs #10007

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

[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	pr23268-3b25e66
	Version	24.8
	Bundle ID	com.jetpack.alpha
	Commit	3b25e66
	App Center Build	jetpack-installable-builds #9058

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

[justtwago]

Nice!
Smoke tested and didn't find any defects. Except one that is not related to this PR: p1716930705777989-slack-C06BWNSR02K