feat: parse replay configuration from backend config

[atzoum]

Description

Reading event replay configurations from backend config and mapping them to sources with destinations of a special replay type & category.

Linear Ticket

Link

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01% 🎉

Comparison is base (c948122) 68.09% compared to head (75bb25a) 68.11%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3703      +/-   ##
==========================================
+ Coverage   68.09%   68.11%   +0.01%     
==========================================
  Files         333      334       +1     
  Lines       51454    51510      +56     
==========================================
+ Hits        35038    35086      +48     
- Misses      14133    14138       +5     
- Partials     2283     2286       +3     

Files Changed	Coverage Δ
backend-config/namespace_config.go	73.28% <100.00%> (+0.62%)	⬆️
backend-config/replay_types.go	100.00% <100.00%> (ø)
backend-config/single_workspace.go	80.00% <100.00%> (+0.17%)	⬆️
backend-config/types.go	82.50% <100.00%> (+8.42%)	⬆️

... and 7 files with indirect coverage changes

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