Enable Test Installer and VSIX stage on Onebranch PR (#6283)

* Enable Test Installer and VSIX stage on Onebranch PR

* IsOneBranch true by default on VSIX and Installer Steps

Author: kythant

build/AzurePipelinesTemplates/WindowsAppSDK-BuildInstaller-Steps.yml

@@ -7,7 +7,7 @@ parameters:
   default: false 
 - name: IsOneBranch
   type: boolean
-  default: false
+  default: true
 - name: runStaticAnalysis
   type: boolean
   default: false

build/AzurePipelinesTemplates/WindowsAppSDK-BuildVSIX-Steps.yml

@@ -4,7 +4,7 @@ parameters:
   default: false
 - name: IsOneBranch
   type: boolean
-  default: false
+  default: true
 - name: IsOfficial
   type: boolean
   default: false 

build/ProjectReunion-BuildFoundation.yml

@@ -49,7 +49,6 @@ resources:
       ref: $(SamplesBranch)
 
 stages:
-
 - template: AzurePipelinesTemplates\WindowsAppSDK-BuildInstaller-Stage.yml@self
 
 - template: AzurePipelinesTemplates\WindowsAppSDK-BuildVSIX-Stage.yml@self

build/WindowsAppSDK-Foundation-PR.yml

@@ -146,3 +146,7 @@ extends:
           runStaticAnalysis: ${{ parameters.runStaticAnalysis }}
           maxParallel_x64: ${{ variables.maxParallelForBuildSamplesCompatJob_x64 }}
           maxParallel_arm64: ${{ variables.maxParallelForBuildSamplesCompatJob_arm64 }}
+
+    - template: AzurePipelinesTemplates\WindowsAppSDK-BuildInstaller-Stage.yml@self
+
+    - template: AzurePipelinesTemplates\WindowsAppSDK-BuildVSIX-Stage.yml@self