Merge branch 'ld-graphql-validation_timeout-revert-and-stub-in-test' into 'master'

Revert "Increase validation timeout in gitlab_schema.rb"

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/150405



Merged-by: Peter Leitzen <pleitzen@gitlab.com>
Approved-by: Jennifer Li <jli@gitlab.com>
Approved-by: Peter Leitzen <pleitzen@gitlab.com>
Reviewed-by: Peter Leitzen <pleitzen@gitlab.com>
Co-authored-by: Luke Duncalfe <lduncalfe@eml.cc>