Stats: Restore referrer spam action eligibility

[crazytonyli]

Fixes https://linear.app/a8c/issue/CMM-2315

This PR ports the legacy Stats' "can mark as spam" check:

WordPress-iOS/WordPress/Classes/ViewRelated/Stats/Shared Views/StatsTotalRow.swift

Lines 87 to 94 in f19e411

	var canMarkReferrerAsSpam: Bool {
	if let url = disclosureURL {
	return url.absoluteString.contains(name)
	} else {
	return name.contains(".")
	}
	}

With this change, the Search Engine referrers no long show the "Mark as Spam" button. The other sites (which may be spam) shows the button.

spam.mp4

Also, added a footer text to explain what "Mark as Spam" does.

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	App Name	WordPress
	Configuration	Release-Alpha
	Build Number	33807
	Version	PR #25904
	Bundle ID	org.wordpress.alpha
	Commit	dfe8920
	Installation URL	28j6ujo6gs638

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

	App Name	Jetpack
	Configuration	Release-Alpha
	Build Number	33807
	Version	PR #25904
	Bundle ID	com.jetpack.alpha
	Commit	dfe8920
	Installation URL	7aahdrc30im98

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