ci: move /dev/kvm permissions setup from to actions/vmtest.yml

The vmtest action is used by several workflows: test, pahole, ondemand.
At the same time, vmtest action requires valid access rights to /dev/kvm
and is the only action that uses it.
This commit moves /dev/kvm permissions setup from test workflow to
vmtest action, in order to make sure that setup logic is shared by all
workflows that run vmtest.
Should fix CI failures like [1].

[1] https://github.com/libbpf/libbpf/actions/runs/7104762048/job/19340484589

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>

.github/workflows/test.yml

@@ -31,22 +31,6 @@ jobs:
             runs_on: s390x
             arch: 's390x'
     steps:
-      # Allow CI user to access /dev/kvm (via qemu) w/o group change/relogin
-      # by changing permissions set by udev.
-      - name: Set /dev/kvm permissions
-        shell: bash
-        run: |
-          if [ -e /dev/kvm ]; then
-            echo "/dev/kvm exists"
-            if [ $(id -u) != 0 ]; then
-              echo 'KERNEL=="kvm", GROUP="kvm", MODE="0666", OPTIONS+="static_node=kvm"' \
-                | sudo tee /etc/udev/rules.d/99-kvm4all.rules > /dev/null
-              sudo udevadm control --reload-rules
-              sudo udevadm trigger --name-match=kvm
-            fi
-          else
-            echo "/dev/kvm does not exist"
-          fi
       - uses: actions/checkout@v3
         name: Checkout
       - uses: ./.github/actions/setup