Extend MediaTests and move to WordPressDataTests

[kean]

In preparation for converting Media to Swift.

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[wpmobilebot]

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

	App Name	WordPress
	Configuration	Release-Alpha
	Build Number	31088
	Version	PR #25287
	Bundle ID	org.wordpress.alpha
	Commit	299420a
	Installation URL	26a5nf418rp78

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[wpmobilebot]

📲 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	31088
	Version	PR #25287
	Bundle ID	com.jetpack.alpha
	Commit	299420a
	Installation URL	2aar22edquf60

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

[wpmobilebot]

🤖 Build Failure Analysis

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