Prevent Update Notebook dts action from triggering on forked repositories (#2871)

* Add check for the main repository so the action doesn't trigger on forks.

* Update if syntax to match the documentation

* Move the repository check.
Put the check in the overall definition so none of the workflow runs if not the main repository.

* Add check to the codeql workflow too

Author: corbob

.github/workflows/codeql.yml

@@ -11,6 +11,7 @@ jobs:
 
     # CodeQL runs on ubuntu-latest and windows-latest
     runs-on: ubuntu-latest
+    if: github.repository == 'PowerShell/vscode-powershell'
 
     steps:
     - name: Checkout repository

.github/workflows/updateNotebookApi.yml

@@ -13,6 +13,7 @@ jobs:
     defaults:
       run:
         shell: pwsh
+    if: github.repository == 'PowerShell/vscode-powershell'
 
     steps:
     # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it