[llvm] [llvm][Support] Improvements to ListeningSocket functionality and documentation (PR #84710)

[Connor Sughrue via llvm-commits]

cpsughrue wrote:

![image](https://github.com/llvm/llvm-project/assets/55301806/63666c05-e1f2-4edf-b982-8359e620e28a)
During pre-commit CI the unit test,`TIMEOUT_PROVIDED`, failed because the allowed margin of error when comparing `Duration` to `Timeout` was not large enough. @Bigcheese, what do you think about removing the ASSERT that compares `Duration` to `Timeout` and instead solely relying on checking that the returned error code is `std::errc:timed_out`?

https://github.com/llvm/llvm-project/pull/84710