This PR solves #10478 by auto-filling previously used template values in create and update workspace flows.
I decided against explicit user values in settings for these reasons:
* Autofill is far easier to implement
* Users benefit from autofill _by default_ — we don't need to teach them new concepts
* If we decide that autofill creates more harm than good, we can remove it without breaking compatibility
- Adds a template_insights pseudo-resource
- Grants auditor and template admin roles read access on template_insights
- Updates existing RBAC checks to check for read template_insights, falling back to template update permissions where necessary
- Updates TemplateLayout to show Insights tab if can read template_insights or can update template
