Verify that Python version used to launch pipeline matches the Python version that runs sdk_worker.

[damccorm]

We should verify that (major.minor) Python version at launch time matches the version on the workers, and alert users with an error when this is not the case.
Otherwise the job may fail with cryptic errors during DoFn un-pickling such as 'SystemError: unknown opcode'.

Imported from Jira BEAM-11623. Original Jira may contain additional context.
Reported by: tvalentyn.