Do not show devices which were added already

[maxwroc]

Checklist

• I have filled out the template to the best of my ability.
• This only contains 1 feature request (if you have multiple feature requests, open one feature request for each feature request).
• This issue is not a duplicate feature request of previous feature requests.

Is your feature request related to a problem? Please describe.

If you have a lot of battery devices and you are trying to add them one by one it is hard to tell whether the device was already added or not

Describe the solution you'd like

Please filter the devices list to only show the ones for which the integration was not added yet

Describe alternatives you've considered

n/a

Additional context

n/a

[andrew-codechimp]

Hi, yes I have looked at this before but core does not provide filters on the device selector.
I did raise a feature request for it ages ago but not got any attention.

https://community.home-assistant.io/t/allow-the-device-selector-to-include-exclude-devices-like-entity-selector/696714

When I get some free time I may try adding it to core myself.

[andrew-codechimp]

PR to core and frontend raised, if it gets merged I'll be able to implement this
home-assistant/core#165599