Merged PR 53559: fix microbuild add service connection id.

fix microbuild add service connection id.

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#### AI description  (iteration 1)
#### PR Classification
Bug fix addressing a missing service connection configuration in the microbuild pipeline.

#### PR Summary
This pull request updates the microbuild pipeline configuration to include the required service connection ID for artifact signing.
- `eng/pipelines/jobs/prepare-signed-artifacts.yml`: Added the `ConnectedPMEServiceName` parameter with a specified UUID value.
<!-- GitOpsUserAgent=GitOps.Apps.Server.pullrequestcopilot -->

Author: vseanreesermsft

eng/pipelines/jobs/prepare-signed-artifacts.yml

@@ -26,6 +26,7 @@ jobs:
       signType: $(SignType)
       zipSources: false
       feedSource: https://dnceng.pkgs.visualstudio.com/_packaging/MicroBuildToolset/nuget/v3/index.json
+      ConnectedPMEServiceName: 248d384a-b39b-46e3-8ad5-c2c210d5e7ca
     condition: and(succeeded(), in(variables['SignType'], 'real', 'test'))
   - task: DownloadBuildArtifacts@0
     displayName: Download IntermediateUnsignedArtifacts