Log when large files are ignored by GitGuardian Integration
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## Problem
GitGuardian has a limit of 1 MB on the `document` content. See [GitGuardian API doc](https://api.gitguardian.com/docs#operation/content_scan).
We already ignore files that are above 1 MB [here](https://gitlab.com/gitlab-org/gitlab/-/blob/e0355289f7440cb6a0664b00f0c49e879b5e2d38/ee/lib/gitlab/checks/integrations/git_guardian_check.rb#L20).
We need to send out a log in the shell or UI, to the user when a file is ignored without blocking the process .
issue