Total review counts and review counts per location on admin page

[mluo24]

Summary

This PR adds counts for the total number of approved reviews on the platform, and it shows the number of reviews approved for each location (North, West, Collegetown, and Downtown).

Test Plan

I manually verified the counts by counting them in the UI.

Notes

Let me know if it's too ugly and I can change it.

[dti-github-bot]

[diff-counting] Significant lines: 66.

[github-actions]

Visit the preview URL for this PR (updated for commit d66d3ff):

https://cu-apts-staging--pr299-admin-review-counts-c80zw2kk.web.app

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[AnkitLakkapragada]

This change looks really good and is definitely much-needed information for us on the admin page! I like the separation of how you did it based on location to make it better for us to identify where we get our reviews from. When testing, everything seems to work right. Great work and looking forward to seeing this merged!

[cyrus14]

Hey Miranda! This update looks awesome and it's exactly the kind of info we needed on the admin page. I really like how you've grouped it by location; it makes it super easy for us to see where our reviews are coming from. Testing it out, everything seems to be working smoothly. Great job, and I can't wait to see this added!

[thuypham03]

This PR helps the team keeping track and monitor reviews' counts, which significantly contribute to our marketing and developing decision. Good job!