test: disable failing test envs in 20.x CI

29c0324 added a few test environments that are simply not working
20.x branch. Let's disable them to get more useful CI results.

Author: aduh95

.github/workflows/test-linux.yml

@@ -35,11 +35,7 @@ permissions:
 jobs:
   test-linux:
     if: github.event.pull_request.draft == false
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        os: [ubuntu-24.04, ubuntu-24.04-arm]
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2
         with:
@@ -59,10 +55,3 @@ jobs:
         run: make -C node build-ci -j4 V=1 CONFIG_FLAGS="--error-on-warn"
       - name: Test
         run: make -C node run-ci -j4 V=1 TEST_CI_ARGS="-p actions --measure-flakiness 9"
-      - name: Re-run test in a folder whose name contains unusual chars
-        run: |
-          mv node "$DIR"
-          cd "$DIR"
-          ./tools/test.py --flaky-tests keep_retrying -p actions -j 4
-        env:
-          DIR: dir%20with $unusual"chars?'åß∂ƒ©∆¬…`