[Production] Update CLASS threshold date logic, add monitoring test coverage, update date filter logic

[thewatermethod]

Description of change

This PR contains three changes:

• The dashboards (Excluding QA) used the JavaScript date constructor, which adds an hour offset to a string. This means the filters would not encompass the whole day, merely most of it. We tweaked this implementation to make it consistent with the QA dashboard.
• Monitoring services had additional test coverage
• The CLASS threshold calculation on the frontend had it's date adjusted from 2025 to 2027.

How to test

None of these changes can be tested through the UI

Issue(s)

• https://jira.acf.gov/browse/TTAHUB-3715
• https://jira.acf.gov/browse/TTAHUB-3540

Checklists

Every PR

• Meets issue criteria
• JIRA ticket status updated
• Code is meaningfully tested
• Meets accessibility standards (WCAG 2.1 Levels A, AA)
• API Documentation updated
• Boundary diagram updated
• Logical Data Model updated
• Architectural Decision Records written for major infrastructure decisions
• UI review complete
• QA review complete

Before merge to main

• OHS demo complete
• Ready to create production PR

Production Deploy

• Staging smoke test completed

After merge/deploy

• Update JIRA ticket status