test: add missing findBundle option to ensure test cases are executed (#9057)

Add missing `findBundle` option to ensure test cases are executed

Author: haocheng6

packages/rspack-test-tools/tests/configCases/plugins/source-map-dev-tool-plugin-child-compiler/test.config.js

@@ -0,0 +1,6 @@
+/** @type {import("../../../..").TConfigCaseConfig} */
+module.exports = {
+    findBundle: (i, options) => {
+        return ["main.js"];
+    }
+};

packages/rspack-test-tools/tests/configCases/plugins/source-map-dev-tool-plugin-file-context/test.config.js

@@ -0,0 +1,6 @@
+/** @type {import("../../../..").TConfigCaseConfig} */
+module.exports = {
+    findBundle: (i, options) => {
+        return ["main.js"];
+    }
+};