Minor cleanups to ProcessRunner #3985

Job	Run time
LinuxMatrixPrep	13s
MacOSMatrixPrep	12s
WindowsMatrixPrep	13s
codeql-analyze (cpp)	1h 23m 27s
MacOS (MacOS, MacOS-13-XCode-15.2-Debug, macos-13, 15.2, Debug, as of 2024-11-13 we get link erro...	40m 34s
MacOS (MacOS, MacOS-14-XCode-15.3-Debug, macos-14, 15.3, Debug, --apply-default-debug-flags --tra...	21m 30s
MacOS (MacOS, MacOS-15-XCode-16.0, macos-15, 16.0, Release, --apply-default-release-flags --trace...	26m 14s
Linux (Linux, ubuntu-22.04-g++-12, g++-12, ubuntu-latest, sophistsolutionsinc/stroika-buildvm-ubu...	56m 42s
Linux (Linux, ubuntu-24.04-g++-14, g++-14, ubuntu-latest, sophistsolutionsinc/stroika-buildvm-ubu...	56m 54s
Linux (Linux, ubuntu-24.10-g++-14, g++-14, ubuntu-latest, sophistsolutionsinc/stroika-buildvm-ubu...	56m 32s
Windows (Windows, windows-vs2k22-cygwin-x86-Debug, windows-2022, sophistsolutionsinc/stroika-buil...	1h 26m 1s
Windows (Windows, windows-vs2k22-msys-x86_64-Release, windows-2022, sophistsolutionsinc/stroika-b...	2h 22m 27s
	9h 30m 59s

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