Drop iOS 14 Support: Address UIButton API deprecations (#1)

[kean]

Related Issue #20860

Replace a few places that were using deprecated UIButton APIs. Some of the code was dead, so I removed it.

To test:

Menus

• Open Menus
• Add a new menu
• Verify that "Cancel" button is still there and is rendered correctly (before / after)

Notification Comment Details

• This feature has been disabled since 2022, so you'll need to disable “Notification Comment Details” first
• Open Notifications
• Select a comment
• Verify that action buttons are displayed

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): manual testing
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.

[kean]

Not sure why hugging behavior changes with the new button configuration. I couldn't find any related documentation. I asked on Mastodon, and other folks also encountered it. The goal is to ensure the label on the right has a lower hugging priority.

[kean]

This is no-op because true is the default value. (Yes, it's deprecated in iOS 15).

[wpmobilebot]

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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	pr20897-44943c0
	Version	22.6
	Bundle ID	com.jetpack.alpha
	Commit	44943c0
	App Center Build	jetpack-installable-builds #5050

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