Rollup merge of #136029 - ChrisDenton:py-job, r=jieyouxu

Bootstrap: Don't move ownership of job object

I've been thinking about this since the last time I looked at bootstrap's use of job objects. We currently pass ownership of the job object to Python. I feel this is unneeded complexity.

The rationale given (in a comment) is that it helps with `ctrl-c` on `x.py`. But using `ctrl-c` when running `x.py` will also cause `bootstrap.exe` to immediately exit so I don't find that convincing.