Fix suborgrepos tests to mock paginate for glob resolution

The implementation now resolves suborgrepos glob patterns against
installation repos via github.paginate(). Updated the tests to mock
paginate returning the repos that match the patterns.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: decyjphr

test/unit/lib/settings.test.js

@@ -1444,6 +1444,12 @@ repository:
         return Promise.resolve({ data: { content: currentContent } })
       })
 
+      // Mock installation repos for glob resolution
+      stubContext.octokit.paginate = jest.fn().mockResolvedValue([
+        { name: 'repo-a', owner: { login: 'test' } },
+        { name: 'repo-b', owner: { login: 'test' } }
+      ])
+
       // Current subOrgConfigs only has repo-b (repo-a was removed from targeting)
       settings.subOrgConfigs = {
         'repo-b': { source: '.github/suborgs/frontend.yml' }
@@ -1569,6 +1575,12 @@ repository:
         data: { content: previousContent }
       })
 
+      // Mock installation repos for glob resolution
+      stubContext.octokit.paginate = jest.fn().mockResolvedValue([
+        { name: 'repo-a', owner: { login: 'test' } },
+        { name: 'repo-b', owner: { login: 'test' } }
+      ])
+
       // Neither repo matches current targeting
       settings.subOrgConfigs = {}