Add feature gating for new advanced features in Stats

[kean]

Description

Closes CMM-1152 by adding a simple banner for new advanced features in Stats.

The implementation relies on the feature gate implemented on the individual API layer. It returns the following:

"body": {
	"error": "unauthorized",
	"message": "The plan for <your-site-id> does not allow fetching Device stats"
}

Testing instructions

New advanced features: UTM, Devices, and Location by Region and City.

• Verify that new features are available for "Premium" and higher plans
• Verify that the banner is shown for free plans
• Verify that "Explore Plans" opens Dotcom pricing for Dotcom sites and Jetpack pricing for Jetpack sites

Screenshots

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
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 Jetpack by scanning the QR code below to install the corresponding build.

	App Name	Jetpack
	Configuration	Release-Alpha
	Build Number	30684
	Version	PR #25186
	Bundle ID	com.jetpack.alpha
	Commit	bd176b0
	Installation URL	59qp3khour868

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

[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	30684
	Version	PR #25186
	Bundle ID	org.wordpress.alpha
	Commit	bd176b0
	Installation URL	5jt0bmjij2mk8

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