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Fix fake connection leaking for Ci::ApplicationRecord

Thong Kuah requested to merge fix_connection_leak_load_balancer_spec into master

What does this MR do and why?

Fix fake connection leaking for Ci::ApplicationRecord

After the example has run, the Ci::ApplicationRecord#connection_specification_name remained stuck as "Ci::ApplicationRecord" instead of reverting back to "ActiveRecord::Base".

We call model.remove_connection to fix this.

Also, there is no need to setup a (fake) ci connection, if we already have one

Fixes #345181 (closed)

Screenshots or screen recordings

The minimal set of specs passes under all scenarios:

  1. With ci: configured in config/database.yml
  2. With ci: configured in config/database.yml, with GITLAB_LOAD_BALANCING_REUSE_PRIMARY_ci=main
  3. Without ci: configured in config/database.yml
$ bundle exec rspec spec/lib/gitlab/database/load_balancing/load_balancer_spec.rb spec/models/acts_as_taggable_on/tagging_spec.rb
Run options: include {:focus=>true}

All examples were filtered out; ignoring {:focus=>true}

Test environment set up in 9.662431 seconds
.................................................

Finished in 15.78 seconds (files took 20.04 seconds to load)
49 examples, 0 failures

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Edited by Thong Kuah

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