fix(test): match xrayErrorCause by reflected type, not type name

Go 1.27 makes encoding/json's RawMessage an alias for jsontext.Value, so
the runtime type name is now "jsontext.Value". testify's AnythingOfType
matches on that name string, so the three SendInvokeFinishedEvent
expectations stopped matching and the mock panicked on an unexpected call:

    Diff: 1: FAIL: type json.RawMessage != type Value - (jsontext.Value=null)

Switch to mock.IsType, which resolves the type through reflection and so
matches whether or not the alias is in play. This has broken
TestRuntimeErrorFailure_ErrorWhileError and left the localstack branch red
since the go directive bump to 1.27.0 in #122.

Author: carole-lavillonniere

internal/lambda-managed-instances/invoke/running_invoke_test.go

@@ -99,7 +99,7 @@ func mockMetricsBeforeResponse(mocks *runningInvokeMocks) {
 	mocks.metrics.On("TriggerStartRequest")
 	mocks.metrics.On("SendInvokeStartEvent", mock.AnythingOfType("*interop.TracingCtx")).Return(nil)
 	mocks.metrics.On("TriggerSentRequest", mock.AnythingOfType("int64"), mock.AnythingOfType("time.Duration"), mock.AnythingOfType("time.Duration")).Return()
-	mocks.metrics.On("SendInvokeFinishedEvent", mock.AnythingOfType("*interop.TracingCtx"), mock.AnythingOfType("json.RawMessage")).Return(nil)
+	mocks.metrics.On("SendInvokeFinishedEvent", mock.AnythingOfType("*interop.TracingCtx"), mock.IsType(json.RawMessage(nil))).Return(nil)
 }
 
 func checkRunningInvokeMockExpectations(t *testing.T, mocks *runningInvokeMocks) {
@@ -248,7 +248,7 @@ func TestRuntimeErrorFailure_SendInvokeToRuntime_Error(t *testing.T) {
 	mocks.metrics.On("TriggerStartRequest")
 	mocks.metrics.On("SendInvokeStartEvent", mock.AnythingOfType("*interop.TracingCtx")).Return(nil)
 	mocks.metrics.On("TriggerSentResponse", false, err, mock.Anything, 0).Return()
-	mocks.metrics.On("SendInvokeFinishedEvent", mock.AnythingOfType("*interop.TracingCtx"), mock.AnythingOfType("json.RawMessage")).Return(nil)
+	mocks.metrics.On("SendInvokeFinishedEvent", mock.AnythingOfType("*interop.TracingCtx"), mock.IsType(json.RawMessage(nil))).Return(nil)
 
 	invokeErr := runInvoke.RunInvokeAndSendResult(mocks.ctx, &mocks.staticData, &mocks.eaInvokeRequest, &mocks.metrics)
 	assert.Error(t, invokeErr)
@@ -280,7 +280,7 @@ func TestRuntimeErrorFailure_SendInvokeToRuntime_Timeout(t *testing.T) {
 	mocks.metrics.On("TriggerStartRequest")
 	mocks.metrics.On("SendInvokeStartEvent", mock.AnythingOfType("*interop.TracingCtx")).Return(nil)
 	mocks.metrics.On("TriggerSentResponse", false, err, mock.Anything, 0).Return()
-	mocks.metrics.On("SendInvokeFinishedEvent", mock.AnythingOfType("*interop.TracingCtx"), mock.AnythingOfType("json.RawMessage")).Return(nil)
+	mocks.metrics.On("SendInvokeFinishedEvent", mock.AnythingOfType("*interop.TracingCtx"), mock.IsType(json.RawMessage(nil))).Return(nil)
 
 	invokeErr := runInvoke.RunInvokeAndSendResult(mocks.ctx, &mocks.staticData, &mocks.eaInvokeRequest, &mocks.metrics)
 	assert.Error(t, invokeErr)