feat(*): move adminPort to DPP resource

[lobkovilya]

Summary

Today Control Planes don't have an information on admin port in general. Technically adminPort could be looked up through xDS metadata for connected DPPs, but that's not enough if we want to expose /config_dump though Control Plane API. That's why current PR moves the source of truth for admin port from kuma-dp run flags to DPP resource:

networking:
  admin:
    port: 9901

The same is applicable for ZoneIngress.

Full changelog

• disable starting CoreDNS on ZoneIngress, since we aren't hijacking DNS traffic there
• parse BootstrapConfig file in kuma-dp run to get adminPort for MetricsHijacker
• change the default adminPort on Universal to 9901
• add admin section both for DPP and ZoneIngress resources
• deprecate --admin-port flag for kuma-dp
• deprecate KUMA_DATAPLANE_ADMIN_PORT for kuma-dp
• deprecate KUMA_RUNTIME_KUBERNETES_INJECTOR_SIDECAR_CONTAINER_ADMIN_PORT for kuma-cp (since it duplicates KUMA_BOOTSTRAP_SERVER_PARAMS_ADMIN_PORT)
• add Pod annotation kuma.io/envoy-admin-port

Issues resolved

Fix #3717

Documentation

• docs(*): move admin port to DPP resource kuma-website#667

Testing

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

Backwards compatibility

• Update UPGRADE.md with any steps users will need to take when upgrading.
• Add backport-to-stable label if the code follows our backporting policy

[codecov-commenter]

Codecov Report

Merging #3739 (cac0857) into master (2fd98ee) will increase coverage by 0.02%.
The diff coverage is 68.44%.

@@            Coverage Diff             @@
##           master    #3739      +/-   ##
==========================================
+ Coverage   50.98%   51.01%   +0.02%     
==========================================
  Files         930      934       +4     
  Lines       57260    57403     +143     
==========================================
+ Hits        29196    29283      +87     
- Misses      25743    25780      +37     
- Partials     2321     2340      +19     

Impacted Files	Coverage Δ
pkg/config/plugins/runtime/k8s/config.go	86.47% <ø> (-0.08%)	⬇️
pkg/core/alias.go	13.33% <ø> (ø)
...ime/k8s/controllers/gateway_instance_controller.go	0.00% <ø> (ø)
...e/k8s/controllers/gatewayapi/gateway_controller.go	0.00% <ø> (ø)
pkg/plugins/runtime/k8s/metadata/annotations.go	100.00% <ø> (ø)
pkg/plugins/runtime/k8s/plugin.go	1.09% <0.00%> (-0.01%)	⬇️
pkg/plugins/runtime/k8s/plugin_gateway.go	0.00% <0.00%> (ø)
test/e2e/healthcheck/universal/policy_http.go	0.00% <0.00%> (ø)
test/e2e/healthcheck/universal/policy_tcp.go	0.00% <0.00%> (ø)
...ugins/runtime/k8s/controllers/ingress_converter.go	67.50% <20.00%> (-3.17%)	⬇️
... and 31 more

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