[Meta] Investigate and resolve skipped tests

[jasonrhodes]

See tests here: https://github.com/elastic/kibana/issues?q=is%3Aopen+is%3Aissue+label%3ATeam%3Aobs-ux-management+label%3Askipped-test

We need to unskip or otherwise understand why these are causing failures and issues. Each of these issues has been individually added to our board and to our cycle, this is just a meta tracking ticket.

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1. Failing test: X-Pack API Integration Tests.x-pack/test/api_integration/apis/slos/fetch_historical_summary·ts - SLO API Tests fetch historical summary computes the historical summary for a rolling occurrences SLO #183750
   Team:obs-ux-management failed-test +2
2. Failing ES Forward Compatibility: Default CI Group #6 / Uptime app with real-world data uptime ml anomaly can create job successfully #179166
   Team:obs-ux-management failed-test v7.17.24 +3
   
3. Failing test: X-Pack API Integration Tests.x-pack/test/api_integration/apis/slos/get_slo·ts - SLO API Tests Get SLOs gets slos instances #177806
   Team:obs-ux-management failed-test skipped-test v8.15.0 +4
   
4. Failing test: X-Pack API Integration Tests.x-pack/test/api_integration/apis/synthetics/get_monitor·ts - Synthetics API Tests getSyntheticsMonitors get many monitors with page params #169753
   Team:obs-ux-management failed-test skipped-test v8.16.0 +4
   
5. Failing test: Chrome X-Pack Observability UI Functional Tests.x-pack/test/observability_functional/apps/observability/alerts/index·ts - ObservabilityApp Observability alerts Alerts table Date selection Correctly applies date picker selections #115314
   Team:Observability Team:obs-ux-management blocker bug failed-test skipped-test v7.17.24 +7
   

[elasticmachine]

Pinging @elastic/obs-ux-management-team (Team:obs-ux-management)