chore: share the regex for root|page between bundle-config loader and unit-testing config loader

Author: Fatme

Diff for: unit-testing-config-loader.js

@@ -1,9 +1,8 @@
 const { join, relative } = require("path");
 
-module.exports = function ({ appFullPath, projectRoot, angular }) {
+module.exports = function ({ appFullPath, projectRoot, angular, rootPagesRegExp }) {
     // TODO: Consider to use the files property from karma.conf.js
     const testFilesRegExp = /tests\/.*\.js/;
-    const rootPagesRegExp = /(root|page)\.(xml|css|js|ts|scss)/;
     const runnerFullPath = join(projectRoot, "node_modules", "nativescript-unit-test-runner");
     const runnerRelativePath = relative(appFullPath, runnerFullPath);
     let source = `