Fix explain this vulnerability spec

qa/qa/ee/page/project/secure/vulnerability_details.rb

@@ -84,11 +84,12 @@ def training_link_present?(training_name:, url:)
             end
 
             def has_explain_this_vulnerability?
-              has_element?('markdown')
+              has_element?('chat-header') && has_element?('chat-history') &&
+                has_element?('chat-prompt-form')
             end
 
             def explain_this_vulnerability_text
-              find_element('markdown').text
+              find_element('chat-history').text
             end
 
             def has_vulnerability_description?(description:)

qa/qa/specs/features/ee/browser_ui/10_govern/explain_this_vulnerability_spec.rb

@@ -66,7 +66,7 @@ module QA
         explain_this_vulnerability(vuln_name)
         Support::Retrier.retry_on_exception(max_attempts: 4, sleep_interval: 1,
           message: "Retry failed AI did not return expected response") do
-          expect(page.has_content?('Response generated by AI')).to be true
+          expect(page.has_content?('Responses generated by AI')).to be true
 
           EE::Page::Project::Secure::VulnerabilityDetails.perform do |vulnerability_details|
             aggregate_failures do