[release/0.9] Fix process handle leak when launching a job container #2188
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Cherry-picking this PR into release/0.9
#2020
commit: 976716e
CreateProcess gives us back a handle to the newly created process. Previously, we ignored this handle, which meant it was leaking every time we created a new job container (or anything else that uses internal/exec in the future).
Process handle leaks can be bad as an exited process is left as a "zombie" until all handles to it have closed, continuing to use memory.
Fix this by closing the handle from CreateProcess.