chore: join owner, template, and org in new workspace view (#15116)

Joins in fields like `username`, `avatar_url`, `organization_name`,
`template_name` to `workspaces` via a **view**. 
The view must be maintained moving forward, but this prevents needing to
add RBAC permissions to fetch related workspace fields.

coderd/util/slice/slice.go

@@ -55,6 +55,17 @@ func Contains[T comparable](haystack []T, needle T) bool {
 	})
 }
 
+// Find returns the first element that satisfies the condition.
+func Find[T any](haystack []T, cond func(T) bool) (T, bool) {
+	for _, hay := range haystack {
+		if cond(hay) {
+			return hay, true
+		}
+	}
+	var empty T
+	return empty, false
+}
+
 // Overlap returns if the 2 sets have any overlap (element(s) in common)
 func Overlap[T comparable](a []T, b []T) bool {
 	return OverlapCompare(a, b, func(a, b T) bool {