feat: add user-level parameter autofill (#11731)

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

coderd/rbac/object_gen.go

@@ -25,6 +25,7 @@ func AllResources() []Object {
 		ResourceTemplateInsights,
 		ResourceUser,
 		ResourceUserData,
+		ResourceUserWorkspaceBuildParameters,
 		ResourceWildcard,
 		ResourceWorkspace,
 		ResourceWorkspaceApplicationConnect,