chore: reverse proxy warehouse pending-events endpoint

[atzoum]

Description

Expose warehouse's pending-events endpoint in gateway.

Notion 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

Merging #2438 (864c933) into master (45936bb) will increase coverage by 0.05%.
The diff coverage is 45.45%.

@@            Coverage Diff             @@
##           master    #2438      +/-   ##
==========================================
+ Coverage   38.56%   38.61%   +0.05%     
==========================================
  Files         166      166              
  Lines       36636    36645       +9     
==========================================
+ Hits        14127    14152      +25     
+ Misses      21595    21578      -17     
- Partials      914      915       +1     

Impacted Files	Coverage Δ
gateway/gateway.go	54.52% <45.45%> (+<0.01%)	⬆️
config/backend-config/backend-config.go	69.88% <0.00%> (+0.56%)	⬆️
processor/processor.go	72.09% <0.00%> (+0.82%)	⬆️
config/backend-config/namespace_config.go	78.62% <0.00%> (+2.29%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.