Pull Request validation tests

Remove pinned train-core

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:pipeline:expeditor buildkite trigger-pipeline .expeditor/verify.pipeline.yml
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run-lint-and-specs-ruby-3.0.expeditor/run_linux_tests.sh rake
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run-lint-and-specs-ruby-3.1.expeditor/run_linux_tests.sh rake
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Total Job Run Time: 9m 6s