Add networkIsolationPolicy to azure-pipelines-official.yml

[Copilot]

Adds networkIsolationPolicy: Permissive,CFSClean to the pipeline configuration, aligning with the pattern used in dotnet/efcore.

Changes

• Added settings: section under parameters: in the main extends: block
• Set networkIsolationPolicy: Permissive,CFSClean within settings

extends:
  template: azure-pipelines/MicroBuild.1ES.Official.yml@MicroBuildTemplate
  parameters:
    settings:
      networkIsolationPolicy: Permissive,CFSClean
    sdl:
      sourceAnalysisPool:
        # ... rest of configuration

This setting controls network isolation for pipeline agents, using Permissive for broader network access and CFSClean for file system sanitization between runs.

Original prompt

Update the azure-pipelines-official.yml pipeline configuration to add the setting: networkIsolationPolicy: Permissive,CFSClean. Place this under the 'parameters' section of the main 'extends' block, aligning with the convention used in dotnet/efcore. Make no other changes beyond introducing this key/value pair in the parameters aspect for clarity and maintainability. Ensure the setting matches the style used across dotnet repositories.

This pull request was created from Copilot chat.

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