Part of: #8363

Description

This PR adds support in the Yosemite layer for fetching site summary stats for the Analytics Hub. It adds a new action to fetch the SiteSummaryStats from remote.

For multiple periods, it fetches the interval data and manually converts it into summary stats. (We'll use this for quarters, which we can fetch as 3 month periods because there isn't a supported quarter period for this endpoint. Internal ref: pe5uwI-5c-p2)

Changes

• Updates the naming of stats store errors from SiteVisitStatsStoreError to SiteStatsStoreError to better reflect that they can be any errors returned by SiteStatsRemote.
• Adds the new retrieveSiteSummaryStats to StatsActionV4 and StatsStoreV4 to support retrieving summary stats:
  • When a single period is requested, we make the request to the remote summary stats endpoint.
  • When multiple periods are requested, we make the request to the remote visit stats endpoint. This is because the summary stats endpoint only returns a single period of visitor data. For multiple periods we'll need to summarize the stats from interval data.
• Adds store unit tests.

Testing

This action isn't used in the app yet, so confirm tests look reasonable and pass.

Submitter Checklist

Update release notes:

• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.