Change gitlab_sign_out to sign_out where possible

spec/support/features/issuable_slash_commands_shared_examples.rb

@@ -111,7 +111,7 @@ shared_examples 'issuable record that supports quick actions in its description
 
       context "when current user cannot close #{issuable_type}" do
         before do
-          gitlab_sign_out
+          sign_out(:user)
           sign_in(guest)
           visit public_send("namespace_project_#{issuable_type}_path", project.namespace, project, issuable)
         end
@@ -146,7 +146,7 @@ shared_examples 'issuable record that supports quick actions in its description
 
       context "when current user cannot reopen #{issuable_type}" do
         before do
-          gitlab_sign_out
+          sign_out(:user)
           sign_in(guest)
           visit public_send("namespace_project_#{issuable_type}_path", project.namespace, project, issuable)
         end
@@ -176,7 +176,7 @@ shared_examples 'issuable record that supports quick actions in its description
 
       context "when current user cannot change title of #{issuable_type}" do
         before do
-          gitlab_sign_out
+          sign_out(:user)
           sign_in(guest)
           visit public_send("namespace_project_#{issuable_type}_path", project.namespace, project, issuable)
         end