refactor(relay): delete the SSH relay server, its build assets and tests (#27215)

* wip: delete the SSH relay server and its build, assets and tests

* wip: drop main/relay plugin conformance; WSL reader lookup test

* fix: drop the emptied relay bench; prune baselines

* test: keep the native halves of tests that also covered the relay

* chore(ci): drop shard timings for the deleted relay server tests

* fix: keep the directory listing budget that darwin terminal names now import

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Co-authored-by: m4air <m4air@Mac.localdomain>

.gitattributes

@@ -19,7 +19,6 @@
 # .version, which names the immutable remote install dir. A CRLF checkout makes a
 # Windows-built client disagree with a mac/Linux-built one on the same release,
 # so one host ends up with two relay trees (#17886 review).
-/config/relay-assets/** text eol=lf
 # Pin the bytes so a patch reads and diffs identically on every host. It is NOT
 # what makes the hash right: pnpm hashes a patch LF-normalized, so a CRLF checkout
 # cannot change it. Believing otherwise put a hand-computed raw digest in the