Remove pe_count option from MonitorStage (nv-morpheus#2178)

Closes nv-morpheus#2177


## By Submitting this PR I confirm:
- I am familiar with the [Contributing Guidelines](https://github.com/nv-morpheus/Morpheus/blob/main/docs/source/developer_guide/contributing.md).
- When the PR is ready for review, new or existing tests cover these changes.
- When the PR is ready for review, the documentation is up to date with these changes.

Authors:
  - Yuchen Zhang (https://github.com/yczhang-nv)

Approvers:
  - David Gardner (https://github.com/dagardner-nv)

URL: nv-morpheus#2178

Author: yczhang-nv

python/morpheus/morpheus/stages/general/monitor_stage.py

@@ -150,8 +150,6 @@ def _build_single(self, builder: mrc.Builder, input_node: mrc.SegmentObject) ->
                                                        self._mc._font_style,
                                                        self._mc._determine_count_fn)
 
-            node.launch_options.pe_count = self._config.num_threads
-
         else:
             # Use a component so we track progress using the upstream progress engine. This will provide more accurate
             # results