Ship with write-only creds to an S3 bucket for profile data

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We have:

1. A built-in profiler: https://docs.gitlab.com/ee/development/profiling.html#profiling-a-url
2. A project that runs these and uploads the results to S3: https://gitlab.com/gitlab-com/gitlab-profiler
3. The profile results at https://redash.gitlab.com/dashboard/gitlab-profiler-statistics

There's a gap here: it's still fairly fiddly to actually upload an HTML profile somewhere. We could fill that gap by shipping GitLab with some creds to write to an S3 bucket (or object storage of your choice) that any customer could use to send us a profile of a request.

If that's not an option, then we could at least let administrators set that value, and do so on GitLab.com, so it's easy for people with Rails console access to upload their profile results rather than try to print them as text (which is very noisy).

/cc @stanhu