[ty] Faster iteration on mdtests (#20465)

## Summary

This change reduces MD test compilation time from 6s to 3s on my laptop.
We don't need to build the unit tests and the corpus tests when we're
only interested in Markdown-based tests.

## Test Plan

local benchmarks
This commit is contained in:
David Peter 2025-09-18 12:48:52 +02:00 committed by GitHub
parent 5707958dad
commit 50bd3943da
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@ -46,6 +46,7 @@ class MDTestRunner:
CRATE_NAME, CRATE_NAME,
"--no-run", "--no-run",
"--color=always", "--color=always",
"--test=mdtest",
"--message-format", "--message-format",
message_format, message_format,
], ],