fix(kuma-cp): '/config_dump' request if Global CP is on Kubernetes

[lobkovilya]

Summary

Trim namespace suffix before making a /config_dump request if Global CP is on Kubernetes

Full changelog

• trim namespace suffix

Issues resolved

Fix #4357

Documentation

• Link to the website documentation PR

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 #4363 (082eaf3) into master (ecc63d4) will increase coverage by 0.02%.
The diff coverage is 76.92%.

@@            Coverage Diff             @@
##           master    #4363      +/-   ##
==========================================
+ Coverage   55.41%   55.43%   +0.02%     
==========================================
  Files         941      941              
  Lines       57125    57132       +7     
==========================================
+ Hits        31654    31670      +16     
+ Misses      22964    22959       -5     
+ Partials     2507     2503       -4     

Impacted Files	Coverage Δ
pkg/core/bootstrap/bootstrap.go	66.55% <0.00%> (-0.45%)	⬇️
pkg/envoy/admin/kds_client.go	80.48% <100.00%> (+2.71%)	⬆️
pkg/xds/generator/direct_access_proxy_generator.go	89.65% <0.00%> (-1.15%)	⬇️
pkg/plugins/resources/postgres/store.go	76.79% <0.00%> (+0.42%)	⬆️
pkg/mads/server/server.go	82.72% <0.00%> (+1.81%)	⬆️
pkg/core/resources/manager/cache.go	88.31% <0.00%> (+2.59%)	⬆️
pkg/core/secrets/manager/global_manager.go	45.45% <0.00%> (+3.03%)	⬆️
...s/authn/api-server/tokens/admin_token_bootstrap.go	86.00% <0.00%> (+4.00%)	⬆️
pkg/core/tokens/default_signing_key.go	86.11% <0.00%> (+8.33%)	⬆️

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[slonka]

LGTM, did you check it manually with the gui?