Remove omit_commit_sha feature flag

The ci_pipeline_status_omit_commit_sha_in_cache_key feature flag was
introduced in 13.2 and is now ready for removal.

Changelog: removed

config/feature_flags/development/ci_pipeline_status_omit_commit_sha_in_cache_key.yml

----
-name: ci_pipeline_status_omit_commit_sha_in_cache_key
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/33712
-rollout_issue_url: 
-milestone: '13.2'
-type: development
-group: group::pipeline execution
-default_enabled: true

lib/gitlab/cache/ci/project_pipeline_status.rb

@@ -50,8 +50,6 @@ def has_status?
         def load_status
           return if loaded?
-          return unless Gitlab::Ci::Features.pipeline_status_omit_commit_sha_in_cache_key?(project) || commit
-
           if has_cache?
             load_from_cache
           else
@@ -119,11 +117,7 @@ def loaded?
         end
         def cache_key
-          if Gitlab::Ci::Features.pipeline_status_omit_commit_sha_in_cache_key?(project)
-            "#{Gitlab::Redis::Cache::CACHE_NAMESPACE}:project:#{project.id}:pipeline_status"
-          else
-            "#{Gitlab::Redis::Cache::CACHE_NAMESPACE}:project:#{project.id}:pipeline_status:#{commit&.sha}"
-          end
+          "#{Gitlab::Redis::Cache::CACHE_NAMESPACE}:project:#{project.id}:pipeline_status"
         end
         def commit

lib/gitlab/ci/features.rb

@@ -14,10 +14,6 @@ def self.pipeline_latest?
         ::Feature.enabled?(:ci_pipeline_latest, default_enabled: true)
       end
-      def self.pipeline_status_omit_commit_sha_in_cache_key?(project)
-        Feature.enabled?(:ci_pipeline_status_omit_commit_sha_in_cache_key, project, default_enabled: true)
-      end
-
       # NOTE: The feature flag `disallow_to_create_merge_request_pipelines_in_target_project`
       # is a safe switch to disable the feature for a particular project when something went wrong,
       # therefore it's not supposed to be enabled by default.

spec/lib/gitlab/cache/ci/project_pipeline_status_spec.rb

@@ -83,24 +83,8 @@
           expect(pipeline_status).not_to be_has_cache
         end
-        context 'ci_pipeline_status_omit_commit_sha_in_cache_key is enabled' do
-          before do
-            stub_feature_flags(ci_pipeline_status_omit_commit_sha_in_cache_key: project)
-          end
-
-          it 'makes a Gitaly call' do
-            expect { pipeline_status.load_status }.to change { Gitlab::GitalyClient.get_request_count }.by(1)
-          end
-        end
-
-        context 'ci_pipeline_status_omit_commit_sha_in_cache_key is disabled' do
-          before do
-            stub_feature_flags(ci_pipeline_status_omit_commit_sha_in_cache_key: false)
-          end
-
-          it 'makes a Gitaly calls' do
-            expect { pipeline_status.load_status }.to change { Gitlab::GitalyClient.get_request_count }.by(1)
-          end
+        it 'makes a Gitaly call' do
+          expect { pipeline_status.load_status }.to change { Gitlab::GitalyClient.get_request_count }.by(1)
         end
       end
@@ -111,24 +95,8 @@
           expect(pipeline_status).to be_has_cache
         end
-        context 'ci_pipeline_status_omit_commit_sha_in_cache_key is enabled' do
-          before do
-            stub_feature_flags(ci_pipeline_status_omit_commit_sha_in_cache_key: project)
-          end
-
-          it 'makes no Gitaly calls' do
-            expect { pipeline_status.load_status }.to change { Gitlab::GitalyClient.get_request_count }.by(0)
-          end
-        end
-
-        context 'ci_pipeline_status_omit_commit_sha_in_cache_key is disabled' do
-          before do
-            stub_feature_flags(ci_pipeline_status_omit_commit_sha_in_cache_key: false)
-          end
-
-          it 'makes a Gitaly calls' do
-            expect { pipeline_status.load_status }.to change { Gitlab::GitalyClient.get_request_count }.by(1)
-          end
+        it 'makes no Gitaly calls' do
+          expect { pipeline_status.load_status }.to change { Gitlab::GitalyClient.get_request_count }.by(0)
         end
       end
     end