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
Adds formal API docs for the following APIs:
* Clear SQL cursor
* SQL search
* SQL translate
Other changes:
* Removes and redirects the "Supported REST parameters section." This is now covered in the SQL search API docs.
* Updates a few related xrefs.
Closes#75085
This commit removes types entirely from BulkRequest, both as a global
parameter and as individual entries on update/index/delete lines.
Relates to #41059
