Improve distinction between Mamba and Conda #137

All 647 tests pass in 6m 38s

647 tests ±0 647 ✔️ ±0 6m 38s ⏱️ -12s
    1 suites ±0     0 💤 ±0
    1 files ±0     0 ❌ ±0

Results for commit 0e743c1. ± Comparison against earlier commit 7eb1730.