Namespace and Backspace key

[nmdaniil]

What would you like to be added:
Allow clearing the selected namespace in the filter input using the Backspace key instead of requiring the user to manually uncheck a checkbox with the mouse.

Why is this needed:
Currently, when a namespace is selected, users must search for the checkbox, uncheck it with the mouse, and then return to the keyboard to type a new namespace. This disrupts workflow and slows down navigation.
With this improvement, pressing Backspace would instantly remove the selected namespace, allowing seamless keyboard-based namespace switching without unnecessary mouse interactions.

Environment you are Lens application on:

• Kubernetes distribution: 2025.1.161916-latest
• Desktop OS: MacOs Sonoma