Fix an issue with P2 sites and follow conversation

[kean]

Fixes #18975 and .#20953.

The "Follow Conversation" button will now appear for P2 sites where you don't already have the global "Email me new comments" option enabled, which matches how it works on the web. I'm

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 assigned to the milestone 25.8. The due date for this milestone has already passed. Please assign it to a milestone with a later deadline or check whether the release for this milestone has already been finished.

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	App Name	WordPress Alpha
	Configuration	Release-Alpha
	Build Number	pr24135-9f77e15
	Version	25.7.1
	Bundle ID	org.wordpress.alpha
	Commit	9f77e15
	App Center Build	WPiOS - One-Offs #11571

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📲 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	pr24135-9f77e15
	Version	25.7.1
	Bundle ID	com.jetpack.alpha
	Commit	9f77e15
	App Center Build	jetpack-installable-builds #10602

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