[clang][NFC] Promote CWG3005 test to "ready"

Not updating cxx_dr_status.html yet, because CWG2917 test might need major adjustments before make_cxx_dr_status can be ran.

Author: Endilll

clang/test/CXX/drs/cwg30xx.cpp

@@ -7,7 +7,7 @@
 // RUN: %clang_cc1 -std=c++2c -pedantic-errors -verify=expected %s
 
 
-namespace cwg3005 { // cwg3005: 21 tentatively ready 2025-09-12
+namespace cwg3005 { // cwg3005: 21 ready 2025-09-12
 
 void f(
     int _, // #cwg3005-first-param