feat: Allow inheriting parameters from previous template_versions when updating a template (#2397)

* WIP: feat: Update templates also updates parameters
* Insert params for template version update
* Working implementation of inherited params
* Add "--always-prompt" flag and logging info

coderd/util/slice/slice.go

@@ -0,0 +1,10 @@
+package slice
+
+func Contains[T comparable](haystack []T, needle T) bool {
+	for _, hay := range haystack {
+		if needle == hay {
+			return true
+		}
+	}
+	return false
+}