This should replace the "collect-profiles.sh" script and allow users to
easily collect profiles.
At the moment, it just dumps all profiles into a single zip file. It
does this server-side so it's easy fetch them with curl.
In the future, it would be nice to add:
1. Progress indicators (cpu profiles take 30 seconds).
2. An option to specify which profiles to collect.
But we can handle that later.
Unfortunately, this command doesn't produce symbolized svgs as I didn't
want to depend on having a local go compiler.
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