Make pg_upgrade log message with control file path translatable.

Commit 173c97812f replaced the hardcoded "global/pg_control" in pg_upgrade
log message with a string literal concatenation of XLOG_CONTROL_FILE macro.
However, this change made the message untranslatable.

This commit fixes the issue by using %s with XLOG_CONTROL_FILE instead of
that literal concatenation, allowing the message to be translated properly.
It also wraps the file path in double quotes for consistency with similar
log messages.

Author: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Reviewed-by: Masao Fujii <masao.fujii@gmail.com>
Discussion: https://postgr.es/m/20250407.155546.2129693791769531891.horikyota.ntt@gmail.com

src/bin/pg_upgrade/controldata.c

@@ -758,7 +758,8 @@ disable_old_cluster(transferMode transfer_mode)
 				new_path[MAXPGPATH];
 
 	/* rename pg_control so old server cannot be accidentally started */
-	prep_status("Adding \".old\" suffix to old " XLOG_CONTROL_FILE);
+	/* translator: %s is the file path of the control file */
+	prep_status("Adding \".old\" suffix to old \"%s\"", XLOG_CONTROL_FILE);
 
 	snprintf(old_path, sizeof(old_path), "%s/%s", old_cluster.pgdata, XLOG_CONTROL_FILE);
 	snprintf(new_path, sizeof(new_path), "%s/%s.old", old_cluster.pgdata, XLOG_CONTROL_FILE);
@@ -768,9 +769,10 @@ disable_old_cluster(transferMode transfer_mode)
 	check_ok();
 
 	if (transfer_mode == TRANSFER_MODE_LINK)
+		/* translator: %s/%s is the file path of the control file */
 		pg_log(PG_REPORT, "\n"
 			   "If you want to start the old cluster, you will need to remove\n"
-			   "the \".old\" suffix from %s/%s.old.\n"
+			   "the \".old\" suffix from \"%s/%s.old\".\n"
 			   "Because \"link\" mode was used, the old cluster cannot be safely\n"
 			   "started once the new cluster has been started.",
 			   old_cluster.pgdata, XLOG_CONTROL_FILE);