Use a shared error class

app/models/ci/bridge.rb

@@ -10,6 +10,7 @@ module Ci
     include HasRef
 
     InvalidBridgeTypeError = Class.new(StandardError)
+    InvalidTransitionError = Class.new(StandardError)
 
     belongs_to :project
     belongs_to :trigger_request

app/services/ci/create_cross_project_pipeline_service.rb

@@ -6,7 +6,6 @@ module Ci
     include Gitlab::Utils::StrongMemoize
 
     DuplicateDownstreamPipelineError = Class.new(StandardError)
-    InvalidBridgeTransition = Class.new(StandardError)
 
     def execute(bridge)
       @bridge = bridge
@@ -55,7 +54,7 @@ module Ci
       end
     rescue StateMachines::InvalidTransition => e
       Gitlab::ErrorTracking.track_exception(
-        InvalidBridgeTransition.new(e.message),
+        Ci::Bridge::InvalidTransitionError.new(e.message),
         bridge_id: bridge.id,
         downstream_pipeline_id: pipeline.id)
     end

app/services/ci/pipeline_bridge_status_service.rb

@@ -8,7 +8,8 @@ module Ci
       begin
         pipeline.source_bridge.inherit_status_from_downstream!(pipeline)
       rescue StateMachines::InvalidTransition => e
-        Gitlab::ErrorTracking.track_exception(e,
+        Gitlab::ErrorTracking.track_exception(
+          Ci::Bridge::InvalidTransitionError.new(e.message),
           bridge_id: pipeline.source_bridge.id,
           downstream_pipeline_id: pipeline.id)
       end

spec/services/ci/create_cross_project_pipeline_service_spec.rb

@@ -374,7 +374,7 @@ describe Ci::CreateCrossProjectPipelineService, '#execute' do
         expect(Gitlab::ErrorTracking)
           .to receive(:track_exception)
           .with(
-            instance_of(Ci::CreateCrossProjectPipelineService::InvalidBridgeTransition),
+            instance_of(Ci::Bridge::InvalidTransitionError),
             bridge_id: bridge.id,
             downstream_pipeline_id: kind_of(Numeric))
 

spec/services/ci/pipeline_bridge_status_service_spec.rb

@@ -33,7 +33,7 @@ describe Ci::PipelineBridgeStatusService do
           expect(Gitlab::ErrorTracking)
             .to receive(:track_exception)
             .with(
-              instance_of(StateMachines::InvalidTransition),
+              instance_of(Ci::Bridge::InvalidTransitionError),
               bridge_id: bridge.id,
               downstream_pipeline_id: pipeline.id)