Remove :reliable tag from smoke tests

To prevent running them twice in smoke and reliable runs

qa/qa/specs/features/browser_ui/2_plan/issue/mentions_spec.rb

 # frozen_string_literal: true
 
 module QA
-  RSpec.describe 'Plan', :smoke, :reliable do
+  RSpec.describe 'Plan', :smoke do
     describe 'mention' do
       let(:user) { Resource::User.fabricate_or_use(Runtime::Env.gitlab_qa_username_1, Runtime::Env.gitlab_qa_password_1) }
       let(:project) do

qa/qa/specs/features/ee/browser_ui/10_protect/policies_list_spec.rb

@@ -23,7 +23,7 @@ module QA
           project.visit!
         end
 
-        it 'can load Policies page and view the policies list', :smoke, :reliable, testcase: 'https://gitlab.com/gitlab-org/gitlab/-/quality/test_cases/347589' do
+        it 'can load Policies page and view the policies list', :smoke, testcase: 'https://gitlab.com/gitlab-org/gitlab/-/quality/test_cases/347589' do
           Page::Project::Menu.perform(&:click_on_policies)
 
           EE::Page::Project::Policies::Index.perform do |policies_page|
@@ -33,7 +33,7 @@ module QA
           end
         end
 
-        it 'can navigate to Policy Editor page', :smoke, :reliable, testcase: 'https://gitlab.com/gitlab-org/gitlab/-/quality/test_cases/347611' do
+        it 'can navigate to Policy Editor page', :smoke, testcase: 'https://gitlab.com/gitlab-org/gitlab/-/quality/test_cases/347611' do
           Page::Project::Menu.perform(&:click_on_policies)
 
           EE::Page::Project::Policies::Index.perform(&:click_new_policy_button)

qa/qa/specs/features/ee/browser_ui/10_protect/policy_alerts_list_spec.rb

@@ -23,7 +23,7 @@ module QA
           project.visit!
         end
 
-        it 'can load Threat Monitoring page and view the policy alert list', :smoke, :reliable, testcase: 'https://gitlab.com/gitlab-org/gitlab/-/quality/test_cases/347613' do
+        it 'can load Threat Monitoring page and view the policy alert list', :smoke, testcase: 'https://gitlab.com/gitlab-org/gitlab/-/quality/test_cases/347613' do
           Page::Project::Menu.perform(&:click_on_threat_monitoring)
 
           EE::Page::Project::ThreatMonitoring::AlertsList.perform do |alerts_list|