[Meta] Kibana v7.last test suits are compatible with ES v8.x

[mshustov]

After #122627 Kibana v7.last must be compatible with ES v8.x.
The Operations team added a CI check to verify the compatibility on CI.
Some functional tests using deprecated API (removed in v8.0) started failing. You can find the actual list of failing test suites here
#122962 fixed most of the common problems. We need someone with deeper domain knowledge to fix the remaining test failures. Nore that tests on Kibana 7.last branch are executed in two different setups:

1. the standard CI job: Kibana v7.last <--> Elasticsearch v7.last
2. the major version compatibility check CI job: Kibana v7.last <--> Elasticsearch v8.x

Thus, the test on the 7.17 branch must be compatible with both modes.

This umbrella issue keeps track of the known test failures that need to be addressed by code owners:

• Dashboard [7.17] Dashboard functional tests fail against 8.0 #123080
• Stack Management [7.17] Some UA & Stack Management tests fail when run against ES 8.0 #123083
• Reporting [7.17] Some CSV reporting tests fail when run against ES 8.0 #123082
• Vega viz (confirmed compatibility bug) [7.17] Vega functional tests fail when run against ES 8.0 #123081
• Data plugin search sessions [7.17] Search session tests fail against 8.0 #123062
• Security [7.17] Security tests fail against Elasticsearch v8.0 #123129

Some failures are due to our CI environment and not a bug in Kibana:

• Endpoint [7.17] Some Endpoint tests fail when run against ES 8.0 #123084

[elasticmachine]

Pinging @elastic/kibana-core (Team:Core)

[elasticmachine]

Pinging @elastic/kibana-operations (Team:Operations)

[tylersmalley]

@spalger, I believe you fixed a few of these in your branch. Mind taking a look?

[jbudz]

I believe we can close this. The compatibility builds are passing, and skipped tests have issues opened and can be handled by their respective teams.