Remove duplicate expect for meber specs

.rubocop.yml

@@ -410,7 +410,6 @@ RSpec/RepeatedExample:
     - 'spec/models/ability_spec.rb'
     - 'spec/models/ci/build_spec.rb'
     - 'spec/models/concerns/issuable_spec.rb'
-    - 'spec/models/member_spec.rb'
     - 'spec/models/project_services/chat_message/pipeline_message_spec.rb'
     - 'spec/models/wiki_page_spec.rb'
     - 'spec/routing/admin_routing_spec.rb'

changelogs/unreleased/refactor-member-spec.yml

+---
+title: Refactor duplicate member specs
+merge_request: 28574
+author: Rajendra Kadam
+type: added

spec/models/member_spec.rb

@@ -38,10 +38,6 @@ describe Member do
 
         expect(member).not_to be_valid
       end
-
-      it "is valid otherwise" do
-        expect(member).to be_valid
-      end
     end
 
     context "when an invite email is not provided" do