Merge pull request #48432 from chandanmad/kubectl-set-service-account

Automatic merge from submit-queue (batch tested with PRs 50198, 49051, 48432)

New kubectl command: `kubectl set service-account`

**What this PR does / why we need it**:
Adds a command to update serviceaccount of resources with pod template

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
fixes #45147
**Special notes for your reviewer**:

**Release note**:

```
NONE
```

docs/.generated_docs

@@ -106,6 +106,7 @@ docs/man/man1/kubectl-scale.1
 docs/man/man1/kubectl-set-image.1
 docs/man/man1/kubectl-set-resources.1
 docs/man/man1/kubectl-set-selector.1
+docs/man/man1/kubectl-set-serviceaccount.1
 docs/man/man1/kubectl-set-subject.1
 docs/man/man1/kubectl-set.1
 docs/man/man1/kubectl-stop.1
@@ -201,6 +202,7 @@ docs/user-guide/kubectl/kubectl_set.md
 docs/user-guide/kubectl/kubectl_set_image.md
 docs/user-guide/kubectl/kubectl_set_resources.md
 docs/user-guide/kubectl/kubectl_set_selector.md
+docs/user-guide/kubectl/kubectl_set_serviceaccount.md
 docs/user-guide/kubectl/kubectl_set_subject.md
 docs/user-guide/kubectl/kubectl_taint.md
 docs/user-guide/kubectl/kubectl_top.md

docs/man/man1/kubectl-set-serviceaccount.1

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.

docs/user-guide/kubectl/kubectl_set_serviceaccount.md

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.