Create waitForText() and use it in most places

Closes #3507922

tests/src/FunctionalJavascript/ProjectBrowserExamplePluginTest.php

@@ -52,7 +52,7 @@ class ProjectBrowserExamplePluginTest extends WebDriverTestBase {
     $this->svelteInitHelper('css', '#project-browser .pb-project--grid');
     $this->assertEquals('Grid', $this->getElementText('#project-browser .pb-display__button[value="Grid"]'));
     $this->assertElementIsVisible('css', '#project-browser .pb-project');
-    $this->assertTrue($assert_session->waitForText('Project 1'));
+    $this->assertPageHasText('Project 1');
     $assert_session->pageTextNotContains('No modules found');
     $this->svelteInitHelper('css', '.pb-filter__checkbox');
     $assert_session->elementsCount('css', '.pb-filter__checkbox', 2);