Exclude eng/ directory from http-client-csharp publish triggers

[Copilot]

Changes to engineering infrastructure (pipeline configs, build scripts, rulesets) in packages/http-client-csharp/eng/ should not trigger emitter version publishes.

Changes

Modified packages/http-client-csharp/eng/pipeline/publish.yml to exclude the eng/ directory from publish triggers:

trigger:
  branches:
    include:
      - main
  paths:
    include:
      - packages/http-client-csharp/
    exclude:
      - packages/http-client-csharp/eng/

This prevents unnecessary publishes when modifying:

• Pipeline YAML files
• PowerShell build/test scripts
• Code analysis rulesets and StyleCop configs
• Pipeline images and other eng resources

Original prompt

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This section details on the original issue you should resolve

<issue_title>Don't publish new emitter version if only changes are to eng directory</issue_title>
<issue_description>We should exclude changes to http-client-csharp/eng path as triggering a publish.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Don't publish new emitter version if only changes are to eng directory #9071

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