[FEATURE REQ] Extractor and Publisher support for the workspace-level "All APIs" policy

[michelversluijs]

Please describe the feature.

APIM exposes a workspace-level policy resource (the workspace equivalent of the service-level "All APIs" policy) at workspaces/{workspaceId}/policies/policy (ARM type Microsoft.ApiManagement/service/workspaces/policies, available since API version 2024-05-01).

Neither the extractor nor the publisher currently handles this resource type. If a team adds a policy to the workspace's "All APIs" scope in the Azure portal and runs the extractor, no policy.xml is written at the workspace root — the resource is silently skipped with no warning, no file, and no PR.

This was noted during the original workspace support planning in #274 (April 2023) but was not included when that issue was closed against the v7 release.

[github-actions]

  Thank you for opening this issue! Please be patient while we will look into it and get back to you as this is an open source project. In the meantime make sure you take a look at the [closed issues](https://github.com/Azure/apiops/issues?q=is%3Aissue+is%3Aclosed) in case your question has already been answered. Don't forget to provide any additional information if needed (e.g. scrubbed logs, detailed feature requests,etc.).
  Whenever it's feasible, please don't hesitate to send a Pull Request (PR) our way. We'd greatly appreciate it, and we'll gladly assess and incorporate your changes.

[guythetechie]

Thanks @michelversluijs , I missed this requirement. We'll add it.