[E2E] PROMOTE TO BLOCKING: file_locking_spec.rb

What does this MR do?

Promotes the following e2e tests to the blocking bucket:

1. Create File Locking locks a directory and tries to push as a second user | Testcase | Spec metrics

2. Create File Locking locks a file and unlocks in list | Testcase | Spec metrics

This MR was created based on data from reliable e2e test report: #456047 (closed)

(This MR was automatically generated by gitlab_quality-test_tooling at 2024-04-15 02:05:23 UTC)