fix: only report features on master / standalone warehouse

[lvrach]

Description

Supported features should only be reported by the master or a standalone warehouse setup. Moreover, backend configuration was not initialised for the slave, causing a panic.

Notion Ticket

https://www.notion.so/rudderstacks/only-report-features-on-master-44064ef1dd1d49e59421ffa5545911e7

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

Base: 40.24% // Head: 40.24% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (52c25e4) compared to base (74f268c).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2483      +/-   ##
==========================================
- Coverage   40.24%   40.24%   -0.01%     
==========================================
  Files         169      169              
  Lines       35980    35981       +1     
==========================================
  Hits        14481    14481              
- Misses      20587    20588       +1     
  Partials      912      912              

Impacted Files	Coverage Δ
warehouse/warehouse.go	3.10% <0.00%> (-0.01%)	⬇️
config/backend-config/namespace_config.go	77.37% <0.00%> (-2.19%)	⬇️
utils/httputil/server.go	92.30% <0.00%> (+11.53%)	⬆️

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