Fix alerting dashboards tests failing with security enabled

Replace 'Select clusters' with 'Select data' as the page-load wait
assertion. 'Select clusters' is only rendered when cross-cluster
monitoring is enabled AND the user has remote index permissions. In
the with-security test config, the test user lacks these permissions,
so the CrossClusterConfiguration component never renders.

'Select data' is the DataSource panel title which is always present
regardless of security configuration or cross-cluster settings.

Resolves opensearch-project/alerting-dashboards-plugin#1492

Signed-off-by: Vikhyat Khare <kvikhy@amazon.com>

Author: vikhy-aws

cypress/integration/plugins/alerting-dashboards-plugin/bucket_level_monitor_spec.js

@@ -166,7 +166,7 @@ describe('Bucket-Level Monitors', () => {
       cy.get('input[name="name"]').type(SAMPLE_EXTRACTION_QUERY_MONITOR);
 
       // Wait for input to load and then type in the index name
-      cy.contains('Select clusters');
+      cy.contains('Select data');
       cy.get('#index').type('*{enter}', { force: true });
 
       // Input extraction query
@@ -226,7 +226,7 @@ describe('Bucket-Level Monitors', () => {
 
       // Wait for input to load and then type in the index name
       // Pressing enter at the end to create combo box entry and trigger change events for time field below
-      cy.contains('Select clusters');
+      cy.contains('Select data');
       cy.get('#index').type(`${ALERTING_INDEX.SAMPLE_DATA_ECOMMERCE}{enter}`, {
         force: true,
       });
@@ -346,7 +346,7 @@ describe('Bucket-Level Monitors', () => {
         cy.contains('Edit').click({ force: true });
 
         // Wait for page to load
-        cy.contains('Select clusters');
+        cy.contains('Select data');
 
         // Click on the Index field and type in multiple index names to replicate the bug
         cy.get('#index')

cypress/integration/plugins/alerting-dashboards-plugin/query_level_monitor_spec.js

@@ -127,7 +127,7 @@ describe('Query-Level Monitors', () => {
       cy.get('input[name="name"]').type(SAMPLE_MONITOR, { force: true });
 
       // Wait for input to load and then type in the index name
-      cy.contains('Select clusters');
+      cy.contains('Select data');
       cy.get('#index').type('*', { force: true });
 
       // Add a trigger
@@ -220,7 +220,7 @@ describe('Query-Level Monitors', () => {
       });
 
       // Wait for page to load
-      cy.contains('Select clusters');
+      cy.contains('Select data');
 
       // Click on the Index field and type in multiple index names to replicate the bug
       cy.get('#index')
@@ -350,7 +350,7 @@ describe('Query-Level Monitors', () => {
       cy.get('[data-test-subj="visualEditorRadioCard"]').click({ force: true });
 
       // Wait for page to load
-      cy.contains('Select clusters');
+      cy.contains('Select data');
 
       // Wait for input to load and then type in the index name
       cy.get('#index').type(