Show Number of Namspaces in Cluster View

[MPSebastian]

User story

1. As a user
2. I want the total number os namespaces to be shown i the cluser view
3. So that I can see that information right at the start of the programm

Acceptance criteria

• Show Number of Namespaces in the Cluster Preview (not NaN)

Definition of done (DoD)

• Feature is done when the acceptance criteria are fullfiled
• Feature is done when there are test where it is necessary and they pass
• Feature is done when the linter passes
• Feature is done when it is merged onto our main branch (after the code has been reviewed by at least one other person)
• Feature is done when the code has been documentend or commented properly

DoD general criteria

• Feature has been fully implemented
• Feature has been merged into the mainline
• All acceptance criteria were met
• Product owner approved features
• All tests are passing
• Developers agreed to release