Move to native maintenance_tasks error handler.

[simi]

fixes following warning

DEPRECATION WARNING: MaintenanceTasks.error_handler is deprecated and will be removed in the 3.0 release. Instead, reports will be sent to the Rails error reporter. Do not set a handler and subscribeto the error reporter instead. (called from <main> at /home/retro/code/oss/rubygems.org/config/initializers/maintenance_tasks.rb:1)

It will be reported as following.

Rails.error.report(error, context: task_context, source: "maintenance-tasks")

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.06%. Comparing base (351587c) to head (64c456b).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5424   +/-   ##
=======================================
  Coverage   97.06%   97.06%           
=======================================
  Files         451      451           
  Lines        9391     9391           
=======================================
  Hits         9115     9115           
  Misses        276      276           

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