Drop iOS 14 Support: Remove MenuSheetViewController

[kean]

Related Issue #20860

Remove MenuSheetViewController.swift which was a fallback for UIMenu on iOS 14. It should’ve been originally removed back in iOS 14 update but wasn't because of the incorrect #available(iOS 15, *) attribute (removed in #20917).

To test:

Moderation

• Open the blog/site where you have right for moderation
• Click “Context Menu”
• Verify that the comments moderation menu is presented

No Moderation

• Open the blog/site where you don't have the rights to moderate comments
• Click “Share" button (displayed in the same place as the "Context Menu")
• Verify that the share sheet is displayed

Here is why the code is, in fact, unused:

// In ReaderCommentsViewController.swift

// .menu overrides button's action
cell.accessoryButton.showsMenuAsPrimaryAction = isModerationMenuEnabled(for: comment)
cell.accessoryButton.menu = isModerationMenuEnabled(for: comment) ? menu(for: comment,
                                                                                     indexPath: indexPath,
                                                                                     handler: handler,
                                                                                     sourceView: cell.accessoryButton) : nil

Regression Notes

1. Potential unintended areas of impact: comments moderation
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.

[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	pr20933-b0d45eb
	Version	22.6
	Bundle ID	org.wordpress.alpha
	Commit	b0d45eb
	App Center Build	WPiOS - One-Offs #6073

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	pr20933-b0d45eb
	Version	22.6
	Bundle ID	com.jetpack.alpha
	Commit	b0d45eb
	App Center Build	jetpack-installable-builds #5099

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

[momo-ozawa]

✨