Support max_devices for energy-devices-detail-graph

[karwosts]

Proposed change

Support the max_devices config opton for devices detail graph, similar to the energy devices graph.

I won't open a second documentation PR for this yet, as the original one (home-assistant/home-assistant.io#31559) is still winding through, but I'll get that updated once it settles.

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

Additional information

• This PR fixes or closes issue: fixes Energy devices detail graph not limiting device count #19928
• This PR is related to issue or discussion:
• Link to documentation pull request:

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

[piitaya]

Thank you @karwosts