Use tcp_socket_posix to replace tcp_socket_starboard

[maxz-lab]

b/302741384

[datadog-cobalt-youtube]

Datadog Report

Branch report: maxz-sb16-sb-and-posix
Commit report: beebae5
Test service: cobalt

✅ 0 Failed, 34435 Passed, 6 Skipped, 9m 56.62s Total Time
❄️ 2 New Flaky

New Flaky Tests (2)

• RainyDayAddToSameWaiter - SbPosixSocketWaiterAddTest - Last Failure

  Expand for error

   ../../starboard/nplb/posix_compliance/posix_socket_waiter_add_test.cc:122
   Value of: SbPosixSocketWaiterAdd( waiter, socket, __null, &NoOpSocketWaiterCallback, kSbSocketWaiterInterestRead | kSbSocketWaiterInterestWrite, false)
     Actual: true
   Expected: false
  

• SunnyDay - SbPosixSocketWaiterWaitTest - Last Failure

  Expand for error

   ../../starboard/nplb/posix_compliance/posix_socket_waiter_wait_test.cc:93
   Value of: SbPosixSocketWaiterAdd(waiter, *trio.client_socket_fd_ptr, &values, &FailSocketWaiterCallback, kSbSocketWaiterInterestRead, false)
     Actual: true
   Expected: false