Tests

Split `spec/support/active_record_classes.rb` #843

Job	Run time
smoke-test	33s
linter-check	25s
Yaml linting check	10s
integration-tests (Rails 6.1 with Ruby 2.7)	54s
integration-tests (Rails 7 with Ruby 2.7)	1m 0s
integration-tests (Rails 6.1 with Ruby 3.0)	41s
integration-tests (Rails 7 with Ruby 3.0)	40s
integration-tests (Rails 6.1 with Ruby 3.1)	44s
integration-tests (Rails 7 with Ruby 3.1)	54s
	6m 1s

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