Merged PR 6466: FIX: Dummy Release should be NonOfficial By Default

#### AI description  (iteration 1)
#### PR Classification
This pull request is a bug fix that corrects the dummy release pipeline configuration to default to a non-official setup.

#### PR Summary
The changes update the dummy release pipeline to extend a non-official template and remove outdated TSA settings, ensuring consistency with the refactored release pipelines and preventing accidental production configurations.
- In `OneBranchPipelines/dummy-release-pipeline.yml`, the extension is switched from the official template (`v2/OneBranch.Official.CrossPlat.yml`) to the non-official template (`v2/OneBranch.NonOfficial.CrossPlat.yml`).
- In `OneBranchPipelines/dummy-release-pipeline.yml`, TSA configuration settings have been removed.
- In `OneBranchPipelines/dummy-release-pipeline.yml`, header comments and descriptions were updated to accurately reflect the non-official, testing-only nature of this pipeline.
<!-- GitOpsUserAgent=GitOps.Apps.Server.pullrequestcopilot -->

Related work items: #40517

Author: bewithgaurav

OneBranchPipelines/dummy-release-pipeline.yml

@@ -2,7 +2,7 @@
 # ⚠️ THIS IS A TEST PIPELINE - NOT FOR PRODUCTION RELEASES ⚠️
 # Downloads wheel and symbol artifacts from build pipeline, publishes symbols, and performs dummy ESRP release for testing
 # Uses Maven ContentType instead of PyPI to avoid accidental production releases
-# This pipeline is ALWAYS Official - no NonOfficial option
+# This pipeline is ALWAYS NonOfficial - for testing only, not production
 
 name: $(Year:YY)$(DayOfYear)$(Rev:.r)-Dummy-Release
 
@@ -46,10 +46,10 @@ resources:
       source: 'Build-Release-Package-Pipeline'  # Name of the build pipeline
       trigger: none  # Manual trigger only
 
-# Extend OneBranch official template
-# Always uses Official template for release pipeline
+# Extend OneBranch Nonofficial template
+# Always uses NonOfficial template for dummy pipeline
 extends:
-  template: 'v2/OneBranch.Official.CrossPlat.yml@templates'
+  template: 'v2/OneBranch.NonOfficial.CrossPlat.yml@templates'
 
   parameters:
     # Feature flags
@@ -83,11 +83,6 @@ extends:
       # Publish SDL logs
       publishLogs:
         enabled: true
-      
-      # TSA - Always enabled for Official release pipeline
-      tsa:
-        enabled: true
-        configFile: '$(REPO_ROOT)/.config/tsaoptions.json'
 
     # Pipeline stages
     stages: