[libc++] Make libcxx/selftest a top-level test directory (#144852) These tests aren't actually libc++-specific for the most part. They test the testsuite, so they aren't tied to any implementation. That means anybody using the testsuite should be able to run these tests successfully. The most notable changes are that - `test/libcxx/selftest/modules` moved to `test/libcxx/modules`, since the assumptions these tests check are libc++-specific - there is a new `lit.local.cfg` for `test/selftest` - `selftest/dsl/dsl.sh.py` was modified since the path to the monorepo root changed
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