LLDB tests hanging on premerge runners

We're seeing some LLDB tests hang on the premerge runners, with the default lit timeouts not working. Going into a hanging instance, we can see the following process from `ps aux` that has been running for 10+ hours:
```
gha 1597203 0.0 0.0 1562396 108092 ? Sl Oct30 0:08 /home/gha/llvm-project/build/bin/lldb-dap --connection accept:///tmp/lit-tmp-yp5x_cuj/dap-connection-1585649
```

Running ` lsof -a -p 1597203` we can see the following open file:
```
lldb-dap 1597203 gha 3w REG 0,128 23969 1047917 /home/gha/llvm-project/build/lldb-test-build.noindex/tools/lldb-dap/server/TestDAP_server.test_server_unix_socket/dap.txt
```

Which seems to imply that this test is hanging:
https://github.com/llvm/llvm-project/blob/e5f3d7f4695556a17af7c70bd31aa52f55108301/lldb/test/API/tools/lldb-dap/server/TestDAP_server.py#L71

Looking at a couple other instances, it's not exclusive to this test. I'm also seeing failures in `test_server_interrupt` and `test_server_port`. These are all DAP tests though.