Log maximum size of upload with "entity is too large" error
<!--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=324826) </details> <!--IssueSummary end--> When we report a 413 `entity is too large` error, we should log what the maximum size to be able to determine what limit we hit. We had to look at the Rails console output to determine this for https://gitlab.com/gitlab-org/gitlab-runner/-/jobs/880982067: ```ruby [ gprd ] production> proj = Project.find_by_full_path("gitlab-org/gitlab-runner") => #<Project id:250833 gitlab-org/gitlab-runner>> [ gprd ] production> proj.closest_setting(:max_artifacts_size) => 2000 [ gprd ] production> Ci::JobArtifact.max_artifact_size(type: 'archive', project: proj) => 2097152000 ```
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