### What changes were proposed in this pull request?
Don't open watch when not needed
### Why are the changes needed?
In spark-submit, we currently open a pod watch for any spark submission. If WAIT_FOR_APP_COMPLETION is false, we then immediately ignore the result of the watcher and break out of the watcher.
When submitting spark applications at scale, this is a source of operational pain, since opening the watch relies on opening a websocket, which tends to run into subtle networking issues around negotiating the websocket connection.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Standard tests
Closes#34095 from slothspot/spark-35174.
Authored-by: Dmytro Melnychenko <dmytro.i.am@gmail.com>
Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
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