Change cleanup fixtures to class scope to reduce test overhead · apache/beam@6251616

All 360 tests pass, 140 skipped in 5m 45s

2 files ±0 2 suites ±0 5m 45s ⏱️ - 1m 43s
500 tests +8 360 ✅ +8 140 💤 ±0 0 ❌ ±0
506 runs +8 360 ✅ +8 146 💤 ±0 0 ❌ ±0

Results for commit 6251616. ± Comparison against earlier commit 7766462.