kata-ctl: Clean up a test leftover file explicitely

It was observed that a tmporary file `/tmp/kata_hybrid_vsock02.hvsock`
for test_setup_hvsock_failed() is not removed from time to time.
This leads to a test failure for the same test next time due to the
file permission on a self-hosted runner.
This commit is to explicitely delete the file before the check starts.

Signed-off-by: Hyounggyu Choi <Hyounggyu.Choi@ibm.com>

.github/workflows/static-checks.yaml

@@ -87,6 +87,7 @@ jobs:
         run: |
           sudo chown -R $USER:$USER $GITHUB_WORKSPACE $HOME
           sudo rm -rf $GITHUB_WORKSPACE/*
+          sudo rm -f /tmp/kata_hybrid*  # Sometime we got leftover from test_setup_hvsock_failed()
         if: ${{ matrix.instance != 'ubuntu-20.04' }}
 
       - name: Checkout the code