Fix OneBranch pipeline

[maxtropets]

• Disabled prefix_tree and removed redundant sgx_with_prefix job

• Piped subprocess I/O was causing issues in OneBranch pipelines. No clue why, but I'm guessing that the current approach (snipper below) doesn't work as expected, and falling to process._transport.close() was done prematurely, explaining multiple errors on transmitting data and early process termination

  try:
          async with aiotools.TaskGroup() as tg:
              # These sub-tasks will get cancelled automatically when this one
              # is. They only get cancelled after we leave the `async with` block,
              # which allows us to wait for the process to quit first. This
              # works nicely as it makes sure the log processing tasks get to see
              # the final log messages emitted by cchost on its way out.
              tg.create_task(self._process_stdout(process.stdout))
              tg.create_task(self._process_stderr(process.stderr))
              tg.create_task(self._wait_ready())
  
              await self._wait_for_process(process)
      finally:
          # Old asyncio versions don't always clean up the subprocess'
          # correctly. The cleanup is delayed and frequently happens after
          # the event loop has closed, which leads to noise on out console
          # output. The only readily available workaround it to poke at the
          # implementation details of the process object, and call close() on
          # the transport manually.
          #
          # This is fixed in Python 3.11.1, at which point we won't have to do
          # anything. See https://github.com/python/cpython/issues/88050.
          process._transport.close()  # type: ignore[attr-defined]

• Pytest redirected to {SOURCE_DIR}/out (not a separate directory, as only one can be specified)
• Fixed SGX image link (should be dev in PR pipelines)

TODOs

• [x] log uploading crashed because of mounted directory System.IO.FileLoadException: Unable to load symbolic/hard linked file. Check 'fsutil behavior query SymlinkEvaluation' to ensure proper behavior.
• [x] sgx docker build fails