feat: Provision to configure custom queues & workers (backport #3787)

[mergify[bot]]

linked to: https://github.com/frappe/agent/pull/171

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This is an automatic backport of pull request #3787 done by [Mergify](https://mergify.com).

[codecov[bot]]

Codecov Report

:x: Patch coverage is 44.44444% with 10 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 44.88%. Comparing base (8e8d2e9) to head (5383de2). :warning: Report is 314 commits behind head on master.

Files with missing lines	Patch %	Lines
...press/doctype/deploy_candidate/deploy_candidate.py	44.44%	10 Missing :warning:

:x: Your patch status has failed because the patch coverage (44.44%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3793   +/-   ##
=======================================
  Coverage   44.88%   44.88%           
=======================================
  Files         712      712           
  Lines       48367    48379   +12     
=======================================
+ Hits        21709    21715    +6     
- Misses      26658    26664    +6     

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