[DOP-19793] Make queue name unique within a group

[IlyasDevelopment]

Change Summary

Previously, the Queue name field was unique among all groups. Now it is made unique within group_id. For this purpose, an additional read-only field slug is added, which is generated as $group_id-$name. We use this field as the name of the queue in RabbitMQ.

Checklist

• Commit message and PR title is comprehensive
• Keep the change as small as possible
• Unit and integration tests for the changes exist
• Tests pass on CI and coverage does not decrease
• Documentation reflects the changes where applicable
• docs/changelog/next_release/<pull request or issue id>.<change type>.rst file added describing change
  (see CONTRIBUTING.rst for details.)
• My PR is ready to review.

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 87.66%. Comparing base (cd6386a) to head (aa89ae2).
Report is 83 commits behind head on develop.

Files with missing lines	Patch %	Lines
syncmaster/db/repositories/queue.py	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #119      +/-   ##
===========================================
+ Coverage    87.63%   87.66%   +0.02%     
===========================================
  Files          130      130              
  Lines         3090     3096       +6     
  Branches       241      241              
===========================================
+ Hits          2708     2714       +6     
  Misses         324      324              
  Partials        58       58              

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