Tests

Split `spec/support/active_record_classes.rb` #846

Job	Run time
linter-check	32s
Yaml linting check	4s
integration-tests (Rails 6.1 with Ruby 2.7)	1m 10s
smoke-test	48s
integration-tests (Rails 7 with Ruby 2.7)	1m 12s
integration-tests (Rails 6.1 with Ruby 3.0)	1m 0s
integration-tests (Rails 7 with Ruby 3.0)	57s
integration-tests (Rails 6.1 with Ruby 3.1)	1m 4s
integration-tests (Rails 7 with Ruby 3.1)	1m 13s
	8m 0s

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