Log or expose standard error from internal exec

[shawkins]

Is your enhancement related to a problem? Please describe

If you use pod file operations, such as copy, the stdErr is not requested / captured.

Describe the solution you'd like

We may not simply be able to use terminateOnError because a command like tar will report things on stdErr such as "stripping leading /" - although we may be able to workaround that in other ways like using -C.

At the very least it should be logged.

If a monitor like facility is added via #4236, the stdErr could be exposed there as well.

Describe alternatives you've considered

No response

Additional context

No response