Failed-test gathering currently downloads symbols without a diagnostic rerun and omits Windows minidumps. gather_failed_tests.py now reruns failed labels locally with cached test results disabled, collects .mdmp files, and restores the original nested XML/log results so a passing rerun cannot hide the initial failure. Saved build flags are retained, and the reproduction command preserves quoted arguments. resmoke.bzl uses the execution runtime's PYTHONPATH separator for config generation.

Independent extraction of #63670 after #64688, based on master. Legacy Evergreen task migration and changes to remote-link configuration remain in the final rollout PR.

Windows integration: The broader migration of Windows tests to Bazel runfiles remains in the final rollout PR. Current checks exercise the Windows launcher and failed-test gathering separately. The complete Windows failure → diagnostic rerun → minidump collection path has not yet been validated end to end.