[Logs UI] Implement the Log Rate portion of the results screen

[Kerry350]

Summary

Once we have an "Analysis" tab (#41879), we need to implement the first section of the results screen, which is the log rate analysis results.

The UI will request data for the results from the new log rate results endpoint at /api/infra/log_analysis/results/log_entry_rate (Issue: #42057, PR: #42356).

Either this will be implemented after all of the setup screen functionality (#41877), which will use the newly extended (#42409) ML module API to setup the jobs. Or, if this is to be completed in parellel, the jobs can be setup manually through the ML tab. If taking the latter route, the "Testing hints" section of #42356 can aid in the configuration options to use.

Acceptance criteria

• The Analysis tab - given correct permissions and all of the jobs being setup - will display a log rate section

  • This will display a graph containing the log rate results data and tooltips (:warning: TODO more information here with relevant mockups)

• Failure scenarios:

  • jobs not set up → handled higher up in the hierarchy by showing the setup screen
  • no data → show placeholders
  • failed to fetch data → show error notice in corresponding log rate results section

Mockups

⚠️ These are still in the process of being tweaked

[elasticmachine]

Pinging @elastic/infra-logs-ui