ci(networking): disable BBRv3 patch step in workflow

The BBRv3 patch step is temporarily disabled to investigate network
stability issues in the CI environment. This allows tests to proceed
while root cause analysis is performed.

.github/actions/networking/action.yml

@@ -12,6 +12,7 @@ runs:
   using: "composite"
   steps:
     - name: Patch with BBRv3
+      if: false
       shell: bash
       working-directory: ${{ github.workspace }}/kernel/common
       run: |