Log maximum size of upload with "entity is too large" error
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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
```
issue