Log more lines for exceptions

Gitlab::BacktraceCleaner excludes some 'boring' lines from exception
stack traces: initializers, middlewares, logging code, etc.

This makes sense for development usage, or where we want to trace the
origin of (say) a database query. But in logs - particularly production
logs - we want all of our application code in the stack trace, because
we might have an error in our middleware, or we might be in a particular
code path triggered by a middleware.

lib/gitlab/backtrace_cleaner.rb

 # frozen_string_literal: true
 
+# Remove some GitLab code from backtraces. Do not use this for logging errors in
+# production environments, as the error may be thrown by our middleware.
 module Gitlab
   module BacktraceCleaner
     IGNORE_BACKTRACES = %w[

lib/gitlab/exception_log_formatter.rb

@@ -23,7 +23,7 @@ module Gitlab
       end
 
       if exception.backtrace
-        payload['exception.backtrace'] = Gitlab::BacktraceCleaner.clean_backtrace(exception.backtrace)
+        payload['exception.backtrace'] = Rails.backtrace_cleaner.clean(exception.backtrace)
       end
     end
   end

lib/gitlab/sidekiq_logging/exception_handler.rb

@@ -18,7 +18,7 @@ module Gitlab
           data.merge!(job_data) if job_data.present?
         end
 
-        data[:error_backtrace] = Gitlab::BacktraceCleaner.clean_backtrace(job_exception.backtrace) if job_exception.backtrace.present?
+        data[:error_backtrace] = Rails.backtrace_cleaner.clean(job_exception.backtrace) if job_exception.backtrace.present?
 
         Sidekiq.logger.warn(data)
       end

spec/lib/gitlab/grape_logging/loggers/exception_logger_spec.rb

@@ -98,7 +98,7 @@ RSpec.describe Gitlab::GrapeLogging::Loggers::ExceptionLogger do
         before do
           current_backtrace = caller
           allow(exception).to receive(:backtrace).and_return(current_backtrace)
-          expected['exception.backtrace'] = Gitlab::BacktraceCleaner.clean_backtrace(current_backtrace)
+          expected['exception.backtrace'] = Rails.backtrace_cleaner.clean(current_backtrace)
         end
 
         it 'includes the backtrace' do

spec/lib/gitlab/sidekiq_logging/exception_handler_spec.rb

@@ -33,7 +33,7 @@ RSpec.describe Gitlab::SidekiqLogging::ExceptionHandler do
         error_class: 'RuntimeError',
         error_message: exception_message,
         context: 'Test',
-        error_backtrace: Gitlab::BacktraceCleaner.clean_backtrace(backtrace)
+        error_backtrace: Rails.backtrace_cleaner.clean(backtrace)
       )
 
       expect(logger).to receive(:warn).with(expected_data)