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
Previously attempting to delete a job that had a datafeed
would return an exception. However, this was unnecessarily
pedantic - the user would always want to delete both job
and datafeed together, and would react by deleting the
datafeed and then subsequently deleting the job again.
This change makes the delete job API automatically delete
a datafeed associated with the job. The same level of
force is used for this delete datafeed request as was used
on the delete job request. This means that it's possible
to force-delete an open job with a started datafeed (since
force-delete datafeed will automatically stop a started
datafeed). It's still not possible to delete an opened job
without using force.
