[GLA Analytics] Add view model for Google Campaigns analytics card

[rachelmcr]

Closes: #13186

Why

This adds the UI support needed to display the Google Campaigns analytics card in the Analytics Hub. (Fetching and displaying the card will be done in another PR; for now, the card is still not displayed.)

How

• Adds the Google Programs web report to AnalyticsWebReport, so we can link from the card to the full web report.
• Adds a property showImage to TopPerformersRow.Data. This defaults to true but allows us to hide the image placeholder in the list of campaigns.
• Adds a property topPerformersTitle to AnalyticsTopPerformersCard, to allow a different title for the card and for the list of top performers. (In this case, "Google Campaigns" for the card and "Campaigns" for the list.)
• Adds a view model GoogleAdsCampaignReportCardViewModel to handle the data for the Google Campaigns card.
  • Parses the GoogleAdsCampaignStats for the current and previous period to get the current Total Sales metric and percent change.
  • Parses the GoogleAdsCampaignStats for the current period to get the list of top 5 campaigns by total sales.
  • Provides a link to the Google Programs web report.

Testing information

The new Google Campaigns card isn't yet displayed in the Analytics Hub. There should be no changes to current behavior, in particular no changes to the images showing in the existing top performers cards (Products and Bundles).

To test:

1. Build and run the app.
2. Select "View all store analytics" on a dashboard card to open the Analytics Hub.
3. Confirm all cards load with the expected content (no change from before). In particular, confirm the images and web reports load as expected.

Screenshots

Google Campaigns card	Loading card	Card with error

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• 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 WooCommerce iOS by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce iOS
	Build Number	pr13199-7a0c0b3
	Version	19.2
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	7a0c0b3
	App Center Build	WooCommerce - Prototype Builds #9810

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