[scout/apm] improve page loaded condition check

Author: dmlemeshko

x-pack/solutions/observability/plugins/apm/test/scout/ui/fixtures/page_objects/agent_configurations.ts

@@ -20,17 +20,15 @@ export class AgentConfigurationsPage {
 
   async goto() {
     await this.page.goto(`${this.kbnUrl.app('apm')}/settings/agent-configuration`);
-    await this.page.waitForLoadingIndicatorHidden();
+    await this.page.testSubj.waitForSelector('apmMainContainer');
 
     // Wait for the page content to load
-    this.page.getByRole('heading', { name: 'Settings', level: 1 });
-
-    return this.page;
+    await this.page.getByRole('heading', { name: 'Settings', level: 1 }).waitFor();
   }
 
   async getCreateConfigurationButton() {
     // Wait for the page to be fully loaded
-    this.page.getByRole('heading', { name: 'Configurations', exact: true });
+    await this.page.getByRole('heading', { name: 'Configurations', exact: true }).waitFor();
 
     return this.page.getByText('Create configuration');
   }

x-pack/solutions/observability/plugins/apm/test/scout/ui/fixtures/page_objects/agent_explorer.ts

@@ -16,9 +16,9 @@ export class AgentExplorerPage {
         'apm'
       )}/settings/agent-explorer?kuery=&agentLanguage=&serviceName=&comparisonEnabled=true&environment=ENVIRONMENT_ALL`
     );
-    await this.page.waitForLoadingIndicatorHidden();
-    this.page.getByRole('heading', { name: 'Settings', level: 1 });
+    await this.page.testSubj.waitForSelector('apmMainContainer');
 
-    return this.page;
+    // Wait for the page content to load
+    await this.page.getByRole('heading', { name: 'Settings', level: 1 }).waitFor();
   }
 }

x-pack/solutions/observability/plugins/apm/test/scout/ui/fixtures/page_objects/anomaly_detection.ts

@@ -14,12 +14,10 @@ export class AnomalyDetectionPage {
 
   async goto() {
     await this.page.goto(`${this.kbnUrl.app('apm')}/settings/anomaly-detection`);
-    await this.page.waitForLoadingIndicatorHidden();
+    await this.page.testSubj.waitForSelector('apmMainContainer');
 
     // Wait for the page content to load
-    this.page.getByRole('heading', { name: 'Settings', level: 1 });
-
-    return this.page;
+    await this.page.getByRole('heading', { name: 'Settings', level: 1 }).waitFor();
   }
 
   async getCreateJobButton() {

x-pack/solutions/observability/plugins/apm/test/scout/ui/fixtures/page_objects/service_inventory.ts

@@ -12,6 +12,6 @@ export class ServiceInventoryPage {
 
   async gotoDetailedServiceInventoryWithDateSelected(start: string, end: string) {
     await this.page.goto(`${this.kbnUrl.app('apm')}/services?&rangeFrom=${start}&rangeTo=${end}`);
-    return this.page.waitForLoadingIndicatorHidden();
+    await this.page.testSubj.waitForSelector('apmUnifiedSearchBar');
   }
 }