chore(*) enable gofmt simplify mode (backport #2870)

[mergify]

This is an automatic backport of pull request #2870 done by Mergify.

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[codecov-commenter]

Codecov Report

Merging #2872 (b60b997) into release-1.3 (377dee3) will increase coverage by 0.04%.
The diff coverage is 0.00%.

@@               Coverage Diff               @@
##           release-1.3    #2872      +/-   ##
===============================================
+ Coverage        52.41%   52.45%   +0.04%     
===============================================
  Files              888      888              
  Lines            51755    51755              
===============================================
+ Hits             27127    27148      +21     
+ Misses           22473    22452      -21     
  Partials          2155     2155              

Impacted Files	Coverage Δ
tools/docs/generate.go	0.00% <0.00%> (ø)
pkg/xds/generator/direct_access_proxy_generator.go	83.90% <0.00%> (+1.14%)	⬆️
pkg/dns/vips_allocator.go	74.00% <0.00%> (+1.33%)	⬆️
pkg/mads/server/server.go	84.25% <0.00%> (+1.85%)	⬆️
pkg/core/resources/manager/cache.go	84.41% <0.00%> (+5.19%)	⬆️
pkg/xds/cache/once/cache.go	94.87% <0.00%> (+7.69%)	⬆️
pkg/core/bootstrap/autoconfig.go	54.46% <0.00%> (+8.03%)	⬆️

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