Allow running tests concurrently with watch server, again! #12473
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Supersedes #11900.
This PR is a 'remake' of Steve's: I rebased it on main, and applied what I learned making #12010 and #12064. This results in significant changes from the original, hence the new PR.
The 'runtest' RPC request is now public, in otherlibs.
runtest_rpc.ml{i}
was removed.The behaviour is now (AFAI know what I'm doing) identical between running
dune runtest [ARGUMENTS]
with or without the RPC server.See comments below for details