Delete UPB fuzz GHA tests.

Our new fuzzer tests in upb/util make this obsolete.

PiperOrigin-RevId: 518653168

.github/workflows/cifuzz.yml

@@ -1,29 +0,0 @@
-name: CIFuzz
-on: [pull_request]
-jobs:
- Fuzzing:
-   runs-on: ubuntu-22-large
-   strategy:
-     fail-fast: false
-     matrix:
-       sanitizer: [address, undefined]
-   steps:
-   - name: Build Fuzzers (${{ matrix.sanitizer }})
-     uses: google/oss-fuzz/infra/cifuzz/actions/build_fuzzers@master
-     with:
-       oss-fuzz-project-name: 'upb'
-       dry-run: false
-       sanitizer: ${{ matrix.sanitizer }}
-   - name: Run Fuzzers (${{ matrix.sanitizer }})
-     uses: google/oss-fuzz/infra/cifuzz/actions/run_fuzzers@master
-     with:
-       oss-fuzz-project-name: 'upb'
-       fuzz-seconds: 600
-       dry-run: false
-       sanitizer: ${{ matrix.sanitizer }}
-   - name: Upload Crash
-     uses: actions/upload-artifact@v1
-     if: failure()
-     with:
-       name: ${{ matrix.sanitizer }}-artifacts
-       path: ./out/artifacts