Revert "gh-actions: introduce bazel cache"

We experience some actions which take way too much time. Needs to be investiaged.
See e.g.:
https://github.com/Checkmk/checkmk/actions/runs/12797214564/job/35678614004

This reverts commit 9e2eb7e.

.github/workflows/pr.yaml

@@ -48,14 +48,6 @@ jobs:
       with:
         key: uv-${{ runner.os }}-${{ hashFiles('requirements_all_lock.txt') }}
         path: ${{ env.UV_CACHE_DIR  }}
-    - name: Cache bazel
-      uses: actions/cache@v3
-      with:
-        key: ${{ runner.os }}-bazel-${{ hashFiles('.bazelversion', '.bazelrc', 'WORKSPACE', 'MODULE.bazel') }}
-        path: |
-          ~/.cache/bazel
-        restore-keys: |
-          ${{ runner.os }}-bazel-
     - name: Setup Environment
       run: |
         # ksh: Needed for some "unit test" (test_mk_errpt_aix).