ci: remove verbose flag to keep collecting log output

[leahaeusel]

Description and Context:
What and Why?

To facilitate debugging the GitLab pipeline, I suggest removing the verbose flag of the rm command.

Running this command in verbose mode causes the log to exceed its limit while building 4C, which makes debugging this job difficult:

Related Issues and Pull Requests

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[sbrandstaeter]

Thank you for suggesting this change.
I agree that the overflow is not useful at all, and we rarely need that detailed output.

If we ever need it, we could implement a more advanced solution like piping into a file, copying back to the local machine and publishing it as an artifact.
But I suggest doing that only if needed.