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Draft: Enable parallel runner for gdk e2e tests

Andrejs Cunskis requested to merge andrey-extract-hook-parallel-runner into andrey-parallel-runner-refactor

What does this MR do and why?

  • Execute global hooks before parallel process spawning and skip them inside parallel runs
  • Update junit test reports to work correctly with parallel and retry
  • Set parallel runner count to 4 (empirically devised number which yields satisfactory retry rate, though amount of retries still seems to be higher than without parallel runner)

This update achieves slight total reduction of runtime (few minutes) but reduces amount of parallel CI jobs to 10 from 15 (33% compute cost reduction per executed test stage in the pipeline). The fastest jobs complete in about 15 minutes while the slowest are still in the 20 minute range. The total time might be reduced by evening out the parallel runners groups after !159141 (comment 1996623635) is implemented.

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Edited by Andrejs Cunskis

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