chore(ci): update test runtimes #12199
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This commit adds an automatic scheduler for running busted tests. It replaces the static, shell script based scheduler by a mechanism that distributes the load onto a number of runners. Each runner gets to work on a portion of the tests that need to be run. The scheduler uses historic run time information to distribute the work evenly across runners, with the goal of making them all run for the same amount of time. With the 10 runners configured in the PR, the overall time it takes to run tests is reduced from around 30 minutes to around 10 minutes. Previously, the scheduling for tests was defined by what the run_tests.sh shell script did. This has now changed so that the new JSON file `test_suites.json` is instead used to define the tests that need to run. Like before, each of the test suites can have its own set of environment variables and test exclusions. The test runner has been rewritten in Javascript in order to make it easier to interface with the declarative configuration file and to facilitate reporting and interfacing with busted. A couple of tests had to be changed to isolate them from other tests better. As the tests are no longer run in identical order every time, it has become more important that each test performs any required cleanup before it runs.
This reverts commit c6777dd.
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This PR updates the test runtimes file to incorporate latest statistics for better scheduling.