fix: support substring search on workspace name (#2096)

coderd/database/queries/workspaces.sql

@@ -28,10 +28,10 @@ WHERE
 				owner_id = @owner_id
 		  ELSE true
 	END
-	-- Filter by name
+	-- Filter by name, matching on substring
 	AND CASE
 		  WHEN @name :: text != '' THEN
-				LOWER(name) = LOWER(@name)
+				LOWER(name) LIKE '%' || LOWER(@name) || '%'
 		  ELSE true
 	END
 ;