src: use "constants" string instead of creating new one

Using the same "constants" string in c++.

PR-URL: nodejs#23894
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>

src/node_http2.cc

@@ -3111,7 +3111,7 @@ HTTP_STATUS_CODES(V)
   env->SetMethod(target, "packSettings", PackSettings);
 
   target->Set(context,
-              FIXED_ONE_BYTE_STRING(isolate, "constants"),
+              env->constants_string(),
               constants).FromJust();
   target->Set(context,
               FIXED_ONE_BYTE_STRING(isolate, "nameForErrorCode"),

src/pipe_wrap.cc

@@ -109,7 +109,7 @@ void PipeWrap::Initialize(Local<Object> target,
   NODE_DEFINE_CONSTANT(constants, UV_READABLE);
   NODE_DEFINE_CONSTANT(constants, UV_WRITABLE);
   target->Set(context,
-              FIXED_ONE_BYTE_STRING(env->isolate(), "constants"),
+              env->constants_string(),
               constants).FromJust();
 }
 

src/tcp_wrap.cc

@@ -124,7 +124,7 @@ void TCPWrap::Initialize(Local<Object> target,
   NODE_DEFINE_CONSTANT(constants, SOCKET);
   NODE_DEFINE_CONSTANT(constants, SERVER);
   target->Set(context,
-              FIXED_ONE_BYTE_STRING(env->isolate(), "constants"),
+              env->constants_string(),
               constants).FromJust();
 }