test: fix some unstable test cases for layer stats (#8453)

fix(test): fix some tests error for layer stats

Author: yifancong

packages/rspack-test-tools/tests/__snapshots__/StatsAPI.test.js.snap

@@ -1659,6 +1659,8 @@ Object {
   modules: Array [
     Object {
       children: Array [],
+      issuer: ,
+      issuerName: ,
       layer: test,
       size: 304,
       sizes: Object {
@@ -1668,6 +1670,8 @@ Object {
     },
     Object {
       children: Array [],
+      issuer: ,
+      issuerName: ,
       layer: legacy,
       size: 304,
       sizes: Object {

packages/rspack-test-tools/tests/statsAPICases/layer-stats.js

@@ -27,6 +27,8 @@ module.exports = {
 		};
 		const statsData = stats?.toJson(options);
 		statsData.modules.forEach(mod => {
+			mod.issuer = '';
+			mod.issuerName = '';
 			mod.children = [];
 		});