Fix sanitizer issues in pg_rewind

Fixed memory leak in the JSON parser and added suppressions for pg_rewind

ci_scripts/suppressions/lsan.supp

@@ -51,3 +51,7 @@ leak:bin/pg_waldump/pg_waldump.c
 #pg_dump
 leak:getSchemaData
 leak:dumpDumpableObject
+
+#pg_rewind
+leak:decide_file_actions
+leak:GenerateRecoveryConfig

contrib/pg_tde/src/catalog/tde_keyring_parse_opts.c

@@ -264,6 +264,7 @@ json_kring_object_field_start(void *state, char *fname, bool isnull)
 			break;
 	}
 
+	pfree(fname);
 	return JSON_SUCCESS;
 }