refactor: inline Azure DevOps core template into prompt file

Combines src/templates/shared/identity-setup-azure-devops-core.md directly
into the Azure DevOps prompt template, eliminating a level of indirection.
The two dynamic tokens (ENVIRONMENTS_ARRAY_POWERSHELL/BASH) are now
rendered directly in the prompt template.

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

Author: EMaher

scripts/embed-markdown-templates.mjs

@@ -21,10 +21,6 @@ const templates = [
     exportName: 'copilotConfigureOverridesPromptTemplate',
     path: 'src/templates/copilot/configure-overrides-prompt.md',
   },
-  {
-    exportName: 'azureDevOpsIdentitySetupCoreTemplate',
-    path: 'src/templates/shared/identity-setup-azure-devops-core.md',
-  },
   {
     exportName: 'githubActionsIdentityGuideTemplate',
     path: 'src/templates/identity/identity-guide-github-actions.md',