fix(cncf-kubernetes): correctly shutdown xcom after job is complete

[kjuulh]

closes: #45452
related: #45053

I fixed a regression we encountered when upgrading to the latest cncf-kubernetes provider 10.1.0

I got the following logs when using the original statement

docker run -u 1000 -it alpine sh # alpine container seems to be run under uid 1000 in kubernetes
sh -c trap "exit 0" INT; while true; do sleep 1; done;

kill -2 $(pgrep -u $(whoami) -f 'trap')

whoami
whoami: unknown uid 1000

pgrep -f 'trap' # returns no processes

instead with:

kill -2 $(pgrep -u $(id -u) -f 'sh')

it stops the processes as it should.

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