Revert "chore(build): switch to gh runners" (backport of #16415) (#16419)

Automatic cherry-pick of #16415 for branch release-2.12

Generated by
[action](https://github.com/kumahq/kuma/actions/runs/24997350508)

cherry-picked commit 4dab125

Co-authored-by: Lukasz Dziedziak <lukidzi@gmail.com>

Author: kumahq[bot]

.github/workflows/build-test-distribute.yaml

@@ -111,7 +111,7 @@ jobs:
     uses: ./.github/workflows/_test.yaml
     with:
       FULL_MATRIX: ${{ needs.check.outputs.FULL_MATRIX }}
-      RUNNERS_BY_ARCH: '{"amd64":"ubuntu-24.04","arm64":"ubuntu-24.04-arm"}'
+      RUNNERS_BY_ARCH: ${{ (github.event_name == 'push' || github.event_name == 'workflow_dispatch' || github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository) && '{"amd64":"ubuntu-latest-kong","arm64":"ubuntu-latest-arm64-kong"}' || '{"amd64":"ubuntu-24.04","arm64":"ubuntu-24.04-arm"}' }}
     secrets: inherit
   build_publish:
     permissions: