feat(ui): cache namespace selection. Closes #2439

[whynowy]

Closes #2439

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
• The title of the PR is (a) conventional, (b) states what changed, and (c) suffixes the related issues number. E.g. "fix(controller): Updates such and such. Fixes #1234".
• I have written unit and/or e2e tests for my change. PRs without these are unlike to be merged.
• Optional. I've added My organization is added to the USERS.md.
• I've signed the CLA and required builds are green.

[alexec]

minor - could this be a getter/setting method,

public get cachedNamespace() {..}

[alexec]

maybe currentNamespace?

[whynowy]

minor - could this be a getter/setting method,

public get cachedNamespace() {..}

It looks like it is not allowed to wrap them as a getter/setter methods in the block of

export const Utils = {
  // allowed
  functionName(): xxx {
     xxxxxx
  }

  // not allowed
  set xxxx(xxx: string){
    xxxxxxxx
  }
}

[whynowy]

maybe currentNamespace?

I'm ok with either one. will change it to current.

[codecov]

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  Hits              ?     3318           
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  Partials          ?      437

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