Add Loglevel configuration for gitlab-sshd implementation of gitlab-shell
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=442711) </details> <!--IssueSummary end--> ### Description Hello, when using the gitlab-sshd implementation of gitlab-shell there is no possibility to set the loglevel to e.g. WARN or ERROR. This is only possible when using the default implementation for gitlab-shell (OpenSSH). However only gitlab-sshd provides the option of exposing metrics. In our case setting the log level is necessary because the gitlab-shell pod logs on average per day 20 million log entries. We can workaround this by filtering logs at the Logging API, but this is a rather coarse grained measure. ### Proposal Please enable the possibility of setting a certain log level of the gitlab-sshd implementation.
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