Merge branch 'rodrigo/add-log-to-gitlab-url-blocker' into 'master'

Log when Gitlab::URLBlocker.validate! is used with blank scheme

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/103535



Merged-by: Kerri Miller <kerrizor@kerrizor.com>
Approved-by: Rajendra Kadam <rkadam@gitlab.com>
Approved-by: Kerri Miller <kerrizor@kerrizor.com>
Approved-by: Kevin Morrison <kmorrison@gitlab.com>
Co-authored-by: Rodrigo Tomonari <rtomonari@gitlab.com>