Refer to replication origin roident as "ID" in user facing messages and docs

The table column that stores this is of type oid, but is actually limited
to uint16 and has a different path for creating new values. Some of
the documentation already referred to it as an ID, so let's standardize
on that.

While at it, most format strings already use %u, so for consintency
change the remaining stragglers using %d.

Per suggestions from Tom Lane and Justin Pryzby
Discussion: https://www.postgresql.org/message-id/3437166.1659620465%40sss.pgh.pa.us
Backpatch to v15

doc/src/sgml/replication-origins.sgml

@@ -27,12 +27,12 @@
  </para>
 
  <para>
-  Replication origins have just two properties, a name and an OID. The name,
+  Replication origins have just two properties, a name and an ID. The name,
   which is what should be used to refer to the origin across systems, is
   free-form <type>text</type>. It should be used in a way that makes conflicts
   between replication origins created by different replication solutions
   unlikely; e.g., by prefixing the replication solution's name to it.
-  The OID is used only to avoid having to store the long version
+  The ID is used only to avoid having to store the long version
   in situations where space efficiency is important. It should never be shared
   across systems.
  </para>

src/backend/replication/logical/origin.c

@@ -328,7 +328,7 @@ replorigin_create(const char *roname)
 	if (tuple == NULL)
 		ereport(ERROR,
 				(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
-				 errmsg("could not find free replication origin OID")));
+				 errmsg("could not find free replication origin ID")));
 
 	heap_freetuple(tuple);
 	return roident;
@@ -364,7 +364,7 @@ restart:
 				if (nowait)
 					ereport(ERROR,
 							(errcode(ERRCODE_OBJECT_IN_USE),
-							 errmsg("could not drop replication origin with OID %d, in use by PID %d",
+							 errmsg("could not drop replication origin with ID %u, in use by PID %d",
 									state->roident,
 									state->acquired_by)));
 
@@ -408,7 +408,7 @@ restart:
 	 */
 	tuple = SearchSysCache1(REPLORIGIDENT, ObjectIdGetDatum(roident));
 	if (!HeapTupleIsValid(tuple))
-		elog(ERROR, "cache lookup failed for replication origin with oid %u",
+		elog(ERROR, "cache lookup failed for replication origin with ID %u",
 			 roident);
 
 	CatalogTupleDelete(rel, &tuple->t_self);
@@ -485,7 +485,7 @@ replorigin_by_oid(RepOriginId roident, bool missing_ok, char **roname)
 		if (!missing_ok)
 			ereport(ERROR,
 					(errcode(ERRCODE_UNDEFINED_OBJECT),
-					 errmsg("replication origin with OID %u does not exist",
+					 errmsg("replication origin with ID %u does not exist",
 							roident)));
 
 		return false;
@@ -937,7 +937,7 @@ replorigin_advance(RepOriginId node,
 		{
 			ereport(ERROR,
 					(errcode(ERRCODE_OBJECT_IN_USE),
-					 errmsg("replication origin with OID %d is already active for PID %d",
+					 errmsg("replication origin with ID %u is already active for PID %d",
 							replication_state->roident,
 							replication_state->acquired_by)));
 		}
@@ -948,7 +948,7 @@ replorigin_advance(RepOriginId node,
 	if (replication_state == NULL && free_state == NULL)
 		ereport(ERROR,
 				(errcode(ERRCODE_CONFIGURATION_LIMIT_EXCEEDED),
-				 errmsg("could not find free replication state slot for replication origin with OID %u",
+				 errmsg("could not find free replication state slot for replication origin with ID %u",
 						node),
 				 errhint("Increase max_replication_slots and try again.")));
 
@@ -1126,7 +1126,7 @@ replorigin_session_setup(RepOriginId node)
 		{
 			ereport(ERROR,
 					(errcode(ERRCODE_OBJECT_IN_USE),
-					 errmsg("replication origin with OID %d is already active for PID %d",
+					 errmsg("replication origin with ID %u is already active for PID %d",
 							curstate->roident, curstate->acquired_by)));
 		}
 
@@ -1138,7 +1138,7 @@ replorigin_session_setup(RepOriginId node)
 	if (session_replication_state == NULL && free_slot == -1)
 		ereport(ERROR,
 				(errcode(ERRCODE_CONFIGURATION_LIMIT_EXCEEDED),
-				 errmsg("could not find free replication state slot for replication origin with OID %u",
+				 errmsg("could not find free replication state slot for replication origin with ID %u",
 						node),
 				 errhint("Increase max_replication_slots and try again.")));
 	else if (session_replication_state == NULL)