Remove size information from the message of ExceedLimitError

Sentry groups the events by the error classes and their messages. If a
message contains parameters, it is not added to the group.

lib/gitlab/sidekiq_middleware/size_limiter/exceed_limit_error.rb

@@ -13,7 +13,7 @@ module Gitlab
           @size = size
           @size_limit = size_limit
 
-          super "#{@worker_class} job exceeds payload size limit (#{size}/#{size_limit})"
+          super "#{@worker_class} job exceeds payload size limit"
         end
 
         def sentry_extra_data

spec/lib/gitlab/sidekiq_middleware/size_limiter/exceed_limit_error_spec.rb

@@ -22,7 +22,7 @@ RSpec.describe Gitlab::SidekiqMiddleware::SizeLimiter::ExceedLimitError do
   it 'encapsulates worker info' do
     exception = described_class.new(TestSizeLimiterWorker, 500, 300)
 
-    expect(exception.message).to eql("TestSizeLimiterWorker job exceeds payload size limit (500/300)")
+    expect(exception.message).to eql("TestSizeLimiterWorker job exceeds payload size limit")
     expect(exception.worker_class).to eql(TestSizeLimiterWorker)
     expect(exception.size).to be(500)
     expect(exception.size_limit).to be(300)