Make check test directives depend on prepare_done

What does this MR do?

It modifies the needs attribute of the check test directives job to depend on prepare_done. It also has a temporary commit to verify that it fixes the original issue.

Why was this MR needed?

When we change the value of CI_IMAGE the check test directives job will start before the prepare ci image job has managed to finish.

What's the best way to test this MR?

The test commit should result in a green build.

What are the relevant issue numbers?

Closes #27961 (closed)