chore(kumactl): prefix MeshGatewayRoutes with ROUTE in inspect dataplane output

[michaelbeaumont]

Summary

The output is otherwise confusing if the route's name doesn't make it clear it's a route.

Changelog: feat(inspect): add gateways to policy inspect

[codecov-commenter]

Codecov Report

Merging #4077 (25359fe) into master (3533601) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4077      +/-   ##
==========================================
- Coverage   55.84%   55.82%   -0.02%     
==========================================
  Files         922      922              
  Lines       55451    55451              
==========================================
- Hits        30966    30958       -8     
- Misses      22034    22040       +6     
- Partials     2451     2453       +2     

Impacted Files	Coverage Δ
app/kumactl/cmd/inspect/inspect_dataplane.go	61.53% <ø> (ø)
pkg/xds/cache/once/cache.go	87.17% <0.00%> (-7.70%)	⬇️
pkg/defaults/components.go	85.18% <0.00%> (-3.71%)	⬇️
pkg/core/resources/manager/cache.go	83.11% <0.00%> (-2.60%)	⬇️
pkg/xds/generator/direct_access_proxy_generator.go	89.65% <0.00%> (-1.15%)	⬇️

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