Geo: when license doesn't include Geo you can't disable it anymore

After 8.9.x release we made Geo (#76) require a special EE Option in the license, so there is a license check in the Geo Nodes admin screen that prevents the user from disabling Geo if it was already enabled before.

There is a workaround with the sales team to manually disable it, but we should make something within the UI, instead of requiring the user to type things on the terminal.

Proposal

I've opted for a minimal solution: 

The license check will not happen in the `#index`nor in the `#destroy`. Form will be disabled and buttons except the **Remove** will be visible in the listing of existing nodes, when the user is not with a correct license.