Add support for
allow_partial_search_results = true/false
command in SQL CLI.
If true, returns partial results if there are shard request timeouts or shard failures.
If false, returns an error with no partial results.
Removes `testenv` annotations and related code. These annotations originally let you skip x-pack snippet tests in the docs. However, that's no longer possible.
Relates to #79309, #31619