chore(*) remove support for google grpc and dataplane token path

[jakubdyszkiewicz]

Summary

Due to DNS problems with GoogleGRPC, in Kuma 1.1.2 we changed the way how we do authentication. Previously, we used EnvoyGRPC with a token. We kept the support of the old way due to compatibility with the old Kuma DP.

I think this should stay in master, not backported to release. Technically, we should support upgrades from 1.1.0 to 1.2.0 and this would be a problem.

Documentation

• No docs

Testing

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

[codecov-commenter]

Codecov Report

Merging #2300 (e092aa8) into master (c682c57) will increase coverage by 0.27%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2300      +/-   ##
==========================================
+ Coverage   51.46%   51.73%   +0.27%     
==========================================
  Files         893      897       +4     
  Lines       41360    41318      -42     
==========================================
+ Hits        21286    21377      +91     
+ Misses      18053    17897     -156     
- Partials     2021     2044      +23     

Impacted Files	Coverage Δ
pkg/core/xds/metadata.go	62.31% <ø> (+0.15%)	⬆️
pkg/xds/bootstrap/generator.go	61.16% <100.00%> (-1.18%)	⬇️
pkg/xds/envoy/tls/v3/tls.go	94.26% <100.00%> (+4.53%)	⬆️
pkg/xds/cache/once/cache.go	86.11% <0.00%> (-8.34%)	⬇️
pkg/xds/context/context.go	68.75% <0.00%> (-6.25%)	⬇️
...kg/plugins/resources/k8s/native/pkg/test/within.go	100.00% <0.00%> (ø)
api/internal/util/proto/proto.go	62.50% <0.00%> (ø)
api/internal/util/proto/types.go	100.00% <0.00%> (ø)
...k8s/native/controllers/proxytemplate_controller.go	0.00% <0.00%> (ø)
api/mesh/v1alpha1/dataplane_helpers.go	77.84% <0.00%> (+1.70%)	⬆️
... and 8 more

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