DRIVERS-2855: Skip $out and mapReduce tests on serverless

[jmikola]

https://jira.mongodb.org/browse/DRIVERS-2855

This was missed in #1547 (bfb6a841819e117aa7f066beae4cfa9da7690a1b)

[x] Test these changes against all server versions and topologies (including standalone, replica set, sharded clusters, and serverless).

...and that was a lie.

See: https://github.com/mongodb/mongo-php-library/pull/1253#discussion_r1523355940

Please complete the following before merging:

• [ ] Update changelog.
• [x] Make sure there are generated JSON files from the YAML test files.
• [x] Test changes in at least one language driver.
• [x] Test these changes against all server versions and topologies (including standalone, replica set, sharded clusters, and serverless).