Merged PR 605422: fixed pipeline to sign binaries using external_distribution

fixed pipeline to sign binaries using external_distribution profile

https://eng.ms/docs/products/onebranch/signing/containerbuildsigning

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#### AI description  (iteration 1)
#### PR Classification
Bug fix to correct the pipeline configuration for signing binaries.

#### PR Summary
This pull request updates the pipeline configuration to use the correct signing profile for external distribution.
- `.pipelines/OneBranch.Official.yml`: Changed `signing_profile` from `internal_azure_service` to `external_distribution`.

Author: May Hartov

.pipelines/OneBranch.Official.yml

@@ -109,7 +109,7 @@ extends:
             inputs:
               command: 'sign'
               signing_environment: 'azure-ado'
-              signing_profile: 'internal_azure_service'
+              signing_profile: 'external_distribution'
               files_to_sign: '**\bin\**\Microsoft.PowerBI.Api.dll;**\obj\**\Microsoft.PowerBI.Api.dll'
               search_root: '$(Build.SourcesDirectory)\sdk\PowerBI.Api'
 
@@ -185,6 +185,6 @@ extends:
             inputs:
               command: 'sign'
               signing_environment: 'azure-ado'
-              signing_profile: 'internal_azure_service'
+              signing_profile: 'external_distribution'
               files_to_sign: '**'
               search_root: '$(OUTPUTROOT)\package'