chore(kuma-cp) improve VIP interface logging

[jpeach]

Summary

Improve the VIP entry stringer so that it show the name of the entry
type. This is shown in logs, where having the type name is a lot clearer.

Full changelog

N/A

Issues resolved

N/A

Documentation

N/A

Testing

• Unit tests
• E2E tests
• Manual testing on Universal
• Manual testing on Kubernetes

Backwards compatibility

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

[codecov-commenter]

Codecov Report

Merging #2377 (0b2d713) into master (b0c72d1) will increase coverage by 0.40%.
The diff coverage is 25.00%.

@@            Coverage Diff             @@
##           master    #2377      +/-   ##
==========================================
+ Coverage   52.13%   52.54%   +0.40%     
==========================================
  Files         874      878       +4     
  Lines       47826    47876      +50     
==========================================
+ Hits        24936    25156     +220     
+ Misses      20865    20670     -195     
- Partials     2025     2050      +25     

Impacted Files	Coverage Δ
pkg/dns/vips/interfaces.go	71.42% <25.00%> (-28.58%)	⬇️
api/internal/util/proto/proto.go	70.00% <0.00%> (ø)
...k8s/native/controllers/proxytemplate_controller.go	0.00% <0.00%> (ø)
...kg/plugins/resources/k8s/native/pkg/test/within.go	100.00% <0.00%> (ø)
api/internal/util/proto/types.go	100.00% <0.00%> (ø)
api/observability/v1/mads.pb.go	35.56% <0.00%> (+1.03%)	⬆️
pkg/xds/generator/direct_access_proxy_generator.go	83.90% <0.00%> (+1.14%)	⬆️
api/mesh/v1alpha1/dataplane_helpers.go	80.16% <0.00%> (+1.68%)	⬆️
pkg/mads/v1/client/client.go	43.75% <0.00%> (+2.50%)	⬆️
pkg/core/resources/manager/cache.go	84.41% <0.00%> (+2.59%)	⬆️
... and 9 more

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