Merge branch 'mc/tr2-process-ancestry-cleanup' into next

Merge branch 'mc/tr2-process-ancestry-cleanup' into next

Add process ancestry data to trace2 on macOS to match what we
already do on Linux and Windows.  Also adjust the way Windows
implementation reports this information to match the other two.

* mc/tr2-process-ancestry-cleanup:
  t0213: add trace2 cmd_ancestry tests
  test-tool: extend trace2 helper with 400ancestry
  trace2: emit cmd_ancestry data for Windows
  trace2: refactor Windows process ancestry trace2 event
  build: include procinfo.c impl for macOS
  trace2: add macOS process ancestry tracing