Launchable: Enable PTS observation mode #12617
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I've enabled the [Predictive Test Selection](https://www.launchableinc.com/docs/features/predictive-test-selection/) feature, which let machine-learning model selects the appropriate tests to reduce CI execution time in #12617. However, I noticed that there are some problems for enabling PTS in Ruby CI after several experiments. Until fixing the problem, I'll disable this feature by removing `launchable subset` command.
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Launchable offers the Predictive Test Selection feature for speeding up CI execution. Predictive Test Selection leverages machine learning to identify the right tests to run for a specific code change. By analyzing data from past test runs and considering the changes being tested, Launchable determines which tests are most relevant.
To evaluate the list of tests that Launchable selects, I enable PTS observation mode. Please note that there is no impacts on CI execution.