Make allow attribute configurable in iframe dashboards

[cvpcs]

Breaking change

Proposed change

This expands upon #19087 by adding configuration to the iframe strategy for dashboards to support setting allow at the dashboard level and flowing the configuration into the iframe card.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

type: iframe
url: https://esphome.localhost
allow: serial

Additional information

This can be useful when enabling integrations as dashboards that require additional feature support (e.g. an esphome iframe and the serial port feature).

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[home-assistant]

Hi @cvpcs

It seems you haven't yet signed a CLA. Please do so here.

Once you do that we will be able to review and accept this pull request.

Thanks!

stale

[piitaya]

User can take control of the dashboard and already add the option, right? I don't think it's necessary to bring card options at the strategy level.

[bramkragten]

I agree with @piitaya