Add lint rule to better manage subscription cancellation

[floreks]

In example namespace list request still happens after the user logs out due to wrongly used takeUntil pipe. We should add lint rules to check such things and also check if subscriptions are properly destroyed overall on changing views.

src/app/frontend/common/components/namespace/component.ts

this.namespaceUpdate_
      .pipe(takeUntil(this.unsubscribe_))
      .pipe(startWith({}))
      .pipe(switchMap(() => this.namespace_.get(this.endpoint_.list())))
      .subscribe(...);

[fejta-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.

If this issue is safe to close now please do so with /close.

Send feedback to sig-testing, kubernetes/test-infra and/or fejta.
/lifecycle stale

[maciaszczykm]

/lifecycle frozen

[romdhanisam]

Related subject, Avoid takeUntil subscription leaks (no-unsafe-takeuntil)