Resolve "Consider tracking the EE test suite with `rspec_profiling`"

Rémy Coutablerequested to merge
29787-monitor-ee-rspec-tests-separately into master

What does this MR do?

  1. Add a ce: or ee: prefix before the branch name reported to the RSpec profiling DB
  2. Only monitor RSpec tests on master: we don't actually use the data for other branches (at least for now)

Are there points in the code the reviewer needs to double check?

  1. The branch name tracking means that our dashboards will need to be updated.
  2. RSPEC_PROFILING_POSTGRES_URL will have to be added to EE

Closes #29787 (closed) /cc @rspeicher

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