Revert "Merge branch 'pl-error-tracking-gems' into 'master'"

.gitlab/ci/gitlab-gems.gitlab-ci.yml

.gitlab/ci/templates/gem.gitlab-ci.yml

Gemfile

Gemfile.lock

doc/development/rake_tasks.md

lib/tasks/gems.rake

vendor/gems/error_tracking_open_api/.gitignore

...or/gems/error_tracking_open_api/.openapi-generator-ignore

vendor/gems/error_tracking_open_api/.openapi-generator/FILES

...r/gems/error_tracking_open_api/.openapi-generator/VERSION

vendor/gems/error_tracking_open_api/LICENSE

vendor/gems/error_tracking_open_api/README.md

vendor/gems/error_tracking_open_api/Rakefile

vendor/gems/error_tracking_open_api/docs/Error.md

vendor/gems/error_tracking_open_api/docs/ErrorEvent.md

vendor/gems/error_tracking_open_api/docs/ErrorStats.md

...r/gems/error_tracking_open_api/docs/ErrorUpdatePayload.md

vendor/gems/error_tracking_open_api/docs/ErrorV2.md

vendor/gems/error_tracking_open_api/docs/ErrorsApi.md

vendor/gems/error_tracking_open_api/docs/ErrorsV2Api.md