Add confirmation dialog for delete namespace

[fleytman]

What would you like to be added:
Add confirmation dialog for delete namespace (with control this dialog in settings)

Why is this needed:
I accidentally misclicked in lens and without confirmation my namespace was deleted. This led to the fact that I had to write to my colleague from vacation to help him with the configuration of the namespace.
If it is possible, it would be nice to make an additional step when deleting a namespace, with confirmation that you are sure of it.

Environment you are Lens application on:

• Desktop OS: macos