Disables metrics assembler change tracking (#445)

# Description

The metrics assembler causes deletion of objects, which in turn triggers
a shape detach error that caused physics errors in some environments. It
wipes information in the metrics assembler layer and that cause a resync
event. This change disables the change listeners in the metric assembler
to avoid this.


## Type of change

<!-- As you go through the list, delete the ones that are not
applicable. -->

- Bug fix (non-breaking change which fixes an issue)


## Checklist

- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./isaaclab.sh --format`
- [x] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have updated the changelog and the corresponding version in the
extension's `config/extension.toml` file
- [ ] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there

<!--
As you go through the checklist above, you can mark something as done by
putting an x character in it

For example,
- [x] I have done this task
- [ ] I have not done this task
-->

---------
Co-authored-by: Kelly Guo <kellyg@nvidia.com>

apps/isaaclab.python.headless.kit

@@ -90,6 +90,9 @@ exts."omni.kit.window.extensions".showFeatureOnly = false
 # set the default ros bridge to disable on startup
 isaac.startup.ros_bridge_extension = ""
 
+# disable the metrics assembler change listener, we don't want to do any runtime changes
+metricsAssembler.changeListenerEnabled = false
+
 # Extensions
 ###############################
 [settings.exts."omni.kit.registry.nucleus"]

apps/isaaclab.python.headless.rendering.kit

@@ -86,6 +86,9 @@ app.vulkan = true
 # disable replicator orchestrator for better runtime perf
 exts."omni.replicator.core".Orchestrator.enabled = false
 
+# disable the metrics assembler change listener, we don't want to do any runtime changes
+metricsAssembler.changeListenerEnabled = false
+
 [settings.exts."omni.kit.registry.nucleus"]
 registries = [
     { name = "kit/default", url = "https://ovextensionsprod.blob.core.windows.net/exts/kit/prod/106/shared" },

apps/isaaclab.python.kit

@@ -128,6 +128,9 @@ omni.replicator.asyncRendering = false # Async rendering must be disabled for SD
 exts."omni.kit.test".includeTests = ["*isaac*"] # Add isaac tests to test runner
 foundation.verifyOsVersion.enabled = false
 
+# disable the metrics assembler change listener, we don't want to do any runtime changes
+metricsAssembler.changeListenerEnabled = false
+
 # set the default ros bridge to disable on startup
 isaac.startup.ros_bridge_extension = ""
 

apps/isaaclab.python.rendering.kit

@@ -84,6 +84,9 @@ app.audio.enabled = false
 # disable replicator orchestrator for better runtime perf
 exts."omni.replicator.core".Orchestrator.enabled = false
 
+# disable the metrics assembler change listener, we don't want to do any runtime changes
+metricsAssembler.changeListenerEnabled = false
+
 [settings.physics]
 updateToUsd = false
 updateParticlesToUsd = false