chore(ci) add area/gateway label

[jpeach]

Summary

Add a anrea/gateway label.

Full changelog

N/A

Issues resolved

N/A

Documentation

N/A

Testing

N/A

Backwards compatibility

• Add backport-to-stable label if the code is backwards compatible. Otherwise, list breaking changes.

[codecov-commenter]

Codecov Report

Merging #3263 (7161b46) into master (a64b152) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3263   +/-   ##
=======================================
  Coverage   52.40%   52.40%           
=======================================
  Files         927      927           
  Lines       54066    54066           
=======================================
+ Hits        28334    28335    +1     
  Misses      23509    23509           
+ Partials     2223     2222    -1     

Impacted Files	Coverage Δ
pkg/plugins/runtime/gateway/route/sorter.go	61.53% <0.00%> (-5.13%)	⬇️
pkg/xds/generator/direct_access_proxy_generator.go	82.75% <0.00%> (-1.15%)	⬇️
pkg/core/resources/manager/cache.go	85.71% <0.00%> (ø)
api/observability/v1/mads.pb.go	35.56% <0.00%> (+1.03%)	⬆️
pkg/mads/v1/client/client.go	43.75% <0.00%> (+2.50%)	⬆️

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