[Meta] Track performance metrics for cloud snapshots and master branch

[dmlemeshko]

As we agreed, we gonna have different load scenarios for testing snapshots and locally build Kibana: Kibana + ES hosted on worker can take higher load so it is irrelevant to compare cloud vs worker results.

We plan to proceed this way:

• monitor cloud by running daily "cloud scenario" for 8.0 (CI trigger) & 7.x (currently triggered manually)
• daily monitor master by building Kibana and using latests ES snapshot, running "local scenario" for it.
• build charts in Kibana stats to:
  • track cloud snaphots performance
  • track master build performance
  • compare dev branch vs master

Tasks:

• define cloud scenario
• define local scenario
• set 7.x trigger on CI
• set master branch trigger on CI
• configure dashboards on build stats

[LeeDr]

1. daily master snapshots on Cloud (Cloud scenario)
2. daily master Kibana branch build (local scenario)
3. ad-hoc load test runner for PRs (local scenario) (these should be comparable to Add esArchiver functionality #2, not Cloud Identify queries associated with scenario/user workflow in log  #1)

Comparison across versions. One-time per release jobs. 7.9, 7.10, etc. Are these on Cloud or local or both?

lower priority
daily Cloud on 7.x or release branch?
daily local on 7.x or release branch?

[dmlemeshko]

1. daily master snapshots on Cloud (Cloud scenario) DONE
2. daily master Kibana branch build (local scenario) DONE