Commits on Jan 22, 2024

1. [kbn/journeys] fix hanging on telemetry call & improve logging (elast… …

   …ic#175194)
   
   ## Summary
   
   This PR fixes the issue causing (mostly) [login
   journey](https://buildkite.com/elastic/kibana-single-user-performance/builds/12398#018d1149-cc2e-4591-a61c-176768081e2c)
   stuck for 14 min waiting for Telemetry call response.
   
   <img width="964" alt="Screenshot 2024-01-22 at 11 12 24"
   src="https://github.com/elastic/kibana/assets/10977896/8cadc2ec-ee84-42f6-8a0c-ad949367429c">
   
   I believe the issue was in how we handle the Observables for request
   events. I added extra comment in the particular code change.
   
   I no longer can reproduce it, all the events are reported correctly:
   <img width="964" alt="image"
   src="https://github.com/elastic/kibana/assets/10977896/fa2c4b27-dcf2-480b-a07f-aeb23045149a">
   
   Logs cleaning is to log in console only performance metrics event but
   not all EBT elements. Also not to report some browser errors that not
   Kibana specific.
   
   Testing:
   
   run the following script 3-4 times
   ```
   PERFORMANCE_ENABLE_TELEMETRY=1 node scripts/run_performance.js --journey-path x-pack/performance/journeys/login.ts
   ```
   
   - script is completed without delays (e.g. doesn't hang on after hook in
   TEST phase)
   - telemetry requests are logged with correct counter and all finished,
   e.g. `Waiting for telemetry request elastic#2 to complete` is followed by
   `Telemetry request elastic#2 complete`
   - only events started with `Report event "performance_metric"` are in
   console output
   
   (cherry picked from commit 8be528e)

   

   dmlemeshko committed Jan 22, 2024
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