Move namespace selector

[floreks]

As we want to introduce more resources (SA, Roles, etc.) it would cause confusion if we'd add non-namespaced resources under namespace selector or have 2 cluster sections for namespaced and non-namespaced resources. We've decided to move the selector to the top bar and add small indicators to show which sections/resources are namespaced and will be influenced by the namespace change.

Additionally, I have updated Discovery and Load Balancing section to Service as this is how it's called now in the k8s docs.

https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.18/#-strong-service-apis-strong-

This is how it looks like

[k8s-ci-robot]

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[maciaszczykm]

What do you think about removing the separator before "Custom Resource Definitions"?

[floreks]

Depends, to which section it belongs in K8S API docs?

[maciaszczykm]

To the cluster section. However, for us it should be a section on its own as we are displaying the pinned CRDs below.

[codecov]

Codecov Report

Merging #5250 into master will decrease coverage by 0.11%.
The diff coverage is 33.70%.

@@            Coverage Diff             @@
##           master    #5250      +/-   ##
==========================================
- Coverage   45.53%   45.42%   -0.12%     
==========================================
  Files         214      214              
  Lines       10117    10208      +91     
  Branches      107      108       +1     
==========================================
+ Hits         4607     4637      +30     
- Misses       5239     5298      +59     
- Partials      271      273       +2     

Impacted Files	Coverage Δ
src/app/backend/api/types.go	35.29% <ø> (ø)
...c/app/frontend/common/services/global/actionbar.ts	45.45% <0.00%> (-4.55%)	⬇️
src/app/backend/handler/apihandler.go	27.74% <28.57%> (+0.03%)	⬆️
src/app/backend/handler/filter.go	45.45% <46.15%> (ø)
src/app/backend/resource/secret/list.go	37.20% <50.00%> (ø)
...rontend/common/components/resourcelist/groupids.ts	100.00% <100.00%> (ø)
.../app/frontend/common/services/resource/endpoint.ts	80.35% <100.00%> (+0.72%)	⬆️
src/app/backend/sync/secret.go	70.29% <0.00%> (-2.98%)	⬇️
...p/backend/integration/metric/common/aggregation.go	89.09% <0.00%> (-1.82%)	⬇️
src/app/frontend/common/pipes/relativetime.ts	25.58% <0.00%> (ø)
... and 2 more

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