Refactor test matrix: most logic at top level, call reusable workflow #1293

All 1 060 tests pass, 6 skipped in 1h 14m 4s

16 files ± 0 16 suites ±0 1h 14m 4s ⏱️ - 1m 52s
1 066 tests ± 0 1 060 ✅ ± 0 6 💤 ±0 0 ❌ ±0
11 387 runs - 739 11 321 ✅ - 743 66 💤 +4 0 ❌ ±0

Results for commit 367b365. ± Comparison against earlier commit d6df1b0.