Remove old_cache_key from set caches

lib/gitlab/reactive_cache_set_cache.rb

@@ -10,11 +10,6 @@ module Gitlab
       @expires_in = expires_in
     end
 
-    # NOTE Remove as part of #331319
-    def old_cache_key(key)
-      "#{cache_namespace}:#{key}:set"
-    end
-
     def cache_key(key)
       super(key)
     end

lib/gitlab/repository_set_cache.rb

@@ -13,11 +13,6 @@ module Gitlab
       @expires_in = expires_in
     end
 
-    # NOTE Remove as part of #331319
-    def old_cache_key(type)
-      "#{type}:#{namespace}:set"
-    end
-
     def cache_key(type)
       super("#{type}:#{namespace}")
     end

lib/gitlab/set_cache.rb

@@ -10,11 +10,6 @@ module Gitlab
       @expires_in = expires_in
     end
 
-    # NOTE Remove as part of https://gitlab.com/gitlab-org/gitlab/-/issues/331319
-    def old_cache_key(key)
-      "#{key}:set"
-    end
-
     def cache_key(key)
       "#{cache_namespace}:#{key}:set"
     end
@@ -25,7 +20,6 @@ module Gitlab
 
       with do |redis|
         keys_to_expire = keys.map { |key| cache_key(key) }
-        keys_to_expire += keys.map { |key| old_cache_key(key) } # NOTE Remove as part of #331319
 
         Gitlab::Instrumentation::RedisClusterValidator.allow_cross_slot_commands do
           redis.unlink(*keys_to_expire)

spec/lib/gitlab/repository_set_cache_spec.rb

@@ -94,12 +94,6 @@ RSpec.describe Gitlab::RepositorySetCache, :clean_gitlab_redis_cache do
 
         expect(cache.read(:foo)).to be_empty
       end
-
-      it 'expires the old key format' do
-        expect_any_instance_of(Redis).to receive(:unlink).with(cache.cache_key(:foo), cache.old_cache_key(:foo)) # rubocop:disable RSpec/AnyInstanceOf
-
-        subject
-      end
     end
 
     context 'multiple keys' do