Remove 'tracing' from Native AOT PR runs (dotnet#92825)

Tracing heavily increases the time it takes to run Native AOT tests.
We already run these tests in the outerloop and the probability that
any given PR will break these tests is low. Outerloop coverage should
be good enough right now.

eng/pipelines/runtime.yml

@@ -297,7 +297,7 @@ extends:
               - template: /eng/pipelines/coreclr/nativeaot-post-build-steps.yml
                 parameters:
                   creator: dotnet-bot
-                  testBuildArgs: 'nativeaot tree ";nativeaot;Loader;Interop;tracing;" /p:BuildNativeAotFrameworkObjects=true'
+                  testBuildArgs: 'nativeaot tree ";nativeaot;Loader;Interop;" /p:BuildNativeAotFrameworkObjects=true'
                   liveLibrariesBuildConfig: Release
                   testRunNamePrefixSuffix: NativeAOT_$(_BuildConfig)
             extraVariablesTemplates: