feat: allow hiding "All namespaces" in namespaces dropdown list

[avanish23]

Closes #8894
With this PR a new option is enabled in the global setting to hide the all-namespaces option in the namespaces dropdown menu in UI.
Briefly explain why this is required
Hides all namespace fields in the namespace selection dropbox to avoid accidental selection in large clusters and prevent OOM errors.

/kind feature

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 35.93%. Comparing base (4b66aa1) to head (c224e63).
Report is 26 commits behind head on master.

Additional details and impacted files

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- Coverage   35.94%   35.93%   -0.01%     
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  Files         301      301              
  Lines       14479    14481       +2     
  Branches      183      183              
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  Hits         5204     5204              
- Misses       9051     9053       +2     
  Partials      224      224              

[floreks]

This feels like a hacky workaround. We are working on introducing a dynamic cache that should greatly improve responsiveness in large clusters. However, storing cached data will probably require greater memory limits.

[avanish23]

/retest

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[avanish23]

/kind feature

[avanish23]

This feels like a hacky workaround. We are working on introducing a dynamic cache that should greatly improve responsiveness in large clusters. However, storing cached data will probably require greater memory limits.

Yes, I agree. This could be treated as a temporary workaround until we have the fix you are talking about.
Do you have any potential issues/concerns this could bring up?

[floreks]

Ye, I don't like introducing temporary flags that will be deprecated and removed shortly after being introduced. It can be confusing. Also, we are trying to avoid container flags that directly manipulate the UI. It should probably be done in a different way. Possibly via settings.

[avanish23]

Ok, this makes sense to be using setting instead. I think it should be added as part of the global setting.
Let me do it that way.

Update: I have made changes to use the settings instead of the container flags.
@floreks looking for reviews.
Thanks!

[floreks]

For some reason namespace switch on settings view is always set to false even after switching to true and saving. Probably the value read from settings config map is not properly propagated to it.

[avanish23]

Oh, I see.
Thanks for the update @floreks, let me take a look at this.

Update:
@floreks, I think I have identified the problem and fixed it.
Can you please check if it works fine now?

[floreks]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: avanish23, floreks

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