Deprecate old transport API for removal in next release #312

All 3 161 tests pass, 751 skipped in 1h 5m 6s

868 files ±0 868 suites ±0 1h 5m 6s ⏱️ +55s
3 912 tests ±0 3 161 ✅ +2 751 💤 ±0 0 ❌ - 2
8 502 runs ±0 6 832 ✅ +2 1 670 💤 ±0 0 ❌ - 2

Results for commit 3127558. ± Comparison against earlier commit 6fcc361.