feat(vpcgw): improve gateway-type list visualization

[yfodil]

feat #2895

[codecov-commenter]

Codecov Report

Merging #2963 (e6a579e) into master (9204148) will increase coverage by 0.34%.
The diff coverage is 72.72%.

@@            Coverage Diff             @@
##           master    #2963      +/-   ##
==========================================
+ Coverage   75.11%   75.45%   +0.34%     
==========================================
  Files         160      163       +3     
  Lines       32862    34732    +1870     
==========================================
+ Hits        24683    26206    +1523     
- Misses       7317     7629     +312     
- Partials      862      897      +35     

Impacted Files	Coverage Δ
...nternal/namespaces/vpcgw/v1/custom_gateway_type.go	66.66% <66.66%> (ø)
internal/namespaces/vpcgw/v1/custom.go	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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