fix(workflow): point Learning Hub Updater allowed-files at website content collection (#3915)

The Learning Hub content lives in website/src/content/docs/learning-hub,
but the workflow's safe-outputs allowed-files globs still pointed at the
old website/learning-hub location. As a result, the daily run produced
valid content updates that were rejected by the code-push guardrail
("patch modifies files outside the allowed-files list"), leaving the
workflow failing and the Learning Hub stale (see #3736, #3720).

- Update allowed-files for create-pull-request and
  push-to-pull-request-branch to website/src/content/docs/learning-hub/**/*.md
- Update the stale website/learning-hub path references in the prompt
- Regenerate learning-hub-updater.lock.yml with gh aw compile (v0.88.8)

.github/workflows/learning-hub-updater.md

@@ -27,13 +27,13 @@ safe-outputs:
     title-prefix: "[bot] "
     base-branch: main
     allowed-files:
-      - "website/learning-hub/**/*.md"
+      - "website/src/content/docs/learning-hub/**/*.md"
   push-to-pull-request-branch:
     target: "*"
     required-title-prefix: "[bot] "
     required-labels: [automated-update, copilot-updates]
     allowed-files:
-      - "website/learning-hub/**/*.md"
+      - "website/src/content/docs/learning-hub/**/*.md"
   close-pull-request:
     target: "*"
     required-labels: [automated-update, copilot-updates]
@@ -43,7 +43,7 @@ safe-outputs:
 
 # Check for Awesome GitHub Copilot Updates
 
-You are a documentation maintainer for the Awesome GitHub Copilot Learning Hub. Your job is to check for recent updates to GitHub Copilot and determine if the Learning Hub pages in `website/learning-hub` need updating.
+You are a documentation maintainer for the Awesome GitHub Copilot Learning Hub. Your job is to check for recent updates to GitHub Copilot and determine if the Learning Hub pages in `website/src/content/docs/learning-hub` need updating.
 
 ## Step 1 — Gather recent Copilot updates
 
@@ -101,7 +101,7 @@ A new page should be created for major features or capabilities that warrant the
 
 To create a new page:
 
-1. Create a new markdown file in the appropriate section of `website/learning-hub` (e.g., `website/learning-hub/agents/new-agent.md`).
+1. Create a new markdown file in the appropriate section of `website/src/content/docs/learning-hub` (e.g., `website/src/content/docs/learning-hub/agents/new-agent.md`).
 2. Write a summary of the new feature, how it works, and its use cases.
 3. Add a "Further Reading" section with links to official documentation, blog posts, and relevant community resources.