Add 50K search term limit

[amanifarooque]

Summary

Updating the limit of query terms we return in the monthly reports.

Preview: https://cg-a72b65a7-73f0-4859-a1d7-dc953cf6ade8.sites.pages.cloud.gov/preview/gsa/search-gov-website/update-monthly-report-limit/admin-center/analytics/monthly-reports.html

PR Checklist

• [x] Test Cloud.gov Pages preview link for your branch for functionality - make sure all links and buttons work, javascript works as intended, and updates display as expected
• [N/A] Conduct a HemingwayApp review of the content for plain language. Request plain language review in #helpwanted if needed before merging this PR
• [N/A] Conduct a Lighthouse Audit via Chrome Developer Tools. Identify any issues that must be addressed before merging, and fix
• [x] Ensure no non-public information is published in the commit messages

[amanifarooque]

@dawnpm Will hold on merging this until the changes are reflected in production, but wanted to get the PR ready while we wait.

[amanifarooque]

@dawnpm updated, ready for you to re-approve!

[amanifarooque]

@dawnpm Can you re-approve when you get the chance? This change will be deployed today.