Revert "build: switch back to the "latest" OneBranch build image (#17630

)"

This reverts commit 39108a7.

build/pipelines/templates-v2/pipeline-onebranch-full-release-build.yml

@@ -106,6 +106,11 @@ extends:
       - stage: Build
         displayName: Build
         dependsOn: []
+        variables:
+          # This was set by the parent build, but we need to override it to select a specific compiler version
+          - template: ./build/pipelines/templates-v2/variables-onebranch-config.yml@self
+            parameters:
+              containerVersion: 1.0.02566.28
         jobs:
           - template: ./build/pipelines/templates-v2/job-build-project.yml@self
             parameters: