ci: cleanup now unused local actions and workflows

Signed-off-by: Ihor Solodrai <ihor.solodrai@pm.me>

.github/workflows/test.yml

@@ -15,12 +15,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        include:
-          - kernel: 'LATEST'
-            runs_on: ubuntu-24.04
-            arch: 'x86_64'
-            llvm-version: '18'
-            pahole: 'master'
+        arch: ['x86_64']
+        kernel: ['LATEST']
+        llvm-version: ['17', '18']
+        pahole: ['master', 'tmp.master']
+        runs_on: ['ubuntu-24.04']
     name: ${{ matrix.kernel }} kernel llvm-${{ matrix.llvm-version }} pahole@${{ matrix.pahole }}
     uses: ./.github/workflows/vmtest.yml
     with: