Automatic merge from submit-queue

Fix kubectl get -f <file> -o <nondefault printer> so it prints all items in the file

**What this PR does / why we need it**: Fix kubectl get -f <file> -o <nondefault printer> so it prints all the objects in the file, instead of just the first one. Also add a test for this feature.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #38907 

**Special notes for your reviewer**:

**Release note**:

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cc @AdoHe @deads2k @liggitt @fabianofranz @kubernetes/kubectl @kubernetes/sig-cli-misc