Cast ENV['RSPEC_PROFILING_POSTGRES_URL'] to symbol in establish_connection call …

What does this MR do?

Casts ENV['RSPEC_PROFILING_POSTGRES_URL'] to symbol in establish_connection call.

DEPRECATION WARNING: Passing a string to ActiveRecord::Base.establish_connection for a configuration lookup is deprecated, please pass a symbol (:"") instead. (called from establish_connection at /builds/gitlab-org/gitlab-ce/config/initializers/rspec_profiling.rb:4)

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

Why was this MR needed?

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Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

assigned to @lbennett

assigned to @stanhu

approved this merge request

merged

mentioned in commit 58d1cd6b

Actually, I'm not sure if this is the right change now. The URL is something in the form of postgresql://. That should be a string, not a symbol.

mentioned in commit e0813022

Related issue: https://github.com/rails/rails/issues/14495

Reverted and created https://gitlab.com/gitlab-org/gitlab-ce/issues/31933.