Extended testing for Kibana plugins

[naemono]

Opening up a topic for discussion about whether we want to add additional integration/e2e tests concerning Kibana plugins. We have recently had issues where we have broken Kibana plugin support without any of our tests failing. The problem with this is that the Kibana plugin has to support the exact version of Kibana (there is no "plugin supports a Kibana range from 8.0 - 8.10"), which means we would need to:

1. Create our own Kibana plugin that we support.
2. Commit to updating it for each stack release (and potentially supporting a -SNAPSHOT version).

How do we feel about this? Is this something we feel is worth our effort that would be required?