tests(*) fix flaky test for locality aware loadbalancing

[jakubdyszkiewicz]

Summary

Locality aware loadbalancing tests were flaky because they were assuming that config is propagated from CP to DP in 0ms.
I've rewritten and moved the test to TrafficRoutes where we have proper test infra to test loadbalancing.

When I did that, I noticed that we have a problem with fair loadbalancing, for which I filed an issue on Github.
The solution is not in the scope of this PR, with this PR I wanted to fix flaky test.

Issues resolved

No issues

Documentation

• No docs

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 #2564 (1e9bf37) into master (94c197e) will increase coverage by 0.05%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2564      +/-   ##
==========================================
+ Coverage   52.30%   52.35%   +0.05%     
==========================================
  Files         868      868              
  Lines       48296    48281      -15     
==========================================
+ Hits        25261    25278      +17     
+ Misses      20991    20958      -33     
- Partials     2044     2045       +1     

Impacted Files	Coverage Δ
test/e2e/deploy/kuma_deploy_universal.go	0.00% <ø> (ø)
.../trafficroute/universal_multizone/traffic_route.go	0.00% <0.00%> (ø)
pkg/insights/resyncer.go	65.81% <0.00%> (+0.85%)	⬆️
pkg/xds/generator/direct_access_proxy_generator.go	83.90% <0.00%> (+1.14%)	⬆️
pkg/core/resources/manager/cache.go	84.41% <0.00%> (+2.59%)	⬆️
pkg/xds/cache/once/cache.go	94.87% <0.00%> (+7.69%)	⬆️
pkg/core/bootstrap/autoconfig.go	54.46% <0.00%> (+8.03%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 94c197e...1e9bf37. Read the comment docs.