Add Roomba last command diagnostic sensor

[Xeio]

Proposed change

Add a diagnostic sensor for the last Roomba command run. This is disabled by default, but provides an attribute to get at the raw parameters used to start the running job.

Note that the top level sensor state is just the raw "command" parameter like "start" or "skip", and that the full parameters are stored into the attributes of the sensor, this is due to the 255 character limit on the sensor value. These job parameters can be very long depending on how many regions were passed in for example.

Copying the parameters into a vacuum job can be used to reproduce the job that was originally created in the Roomba app more easily.

New Sensor:

Example of vacuum job (this isn't new, just showing how this new sensor can be used to more easily configure HA). This isn't quite a seamless copy-paste, the user should remove the "command", "time", and "initiator" when copying because those should be sent by HomeAssistant automatically.

Type of change

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

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
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• Link to frontend pull request:

Checklist

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[home-assistant]

Hey there @pschmitt, @cyr-ius, @shenxn, @Orhideous, mind taking a look at this pull request as it has been labeled with an integration (roomba) you are listed as a code owner for? Thanks!

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[Copilot]

Pull Request Overview

This PR adds a diagnostic sensor to expose the last command run by a Roomba, including its raw parameters, to assist in troubleshooting and reproducing jobs.

• Added an additional sensor in sensor.py for "last_command" with a corresponding attributes function.
• Extended the Roomba entity in entity.py with properties to expose the last command and its parameters.

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
homeassistant/components/roomba/sensor.py	Added a new sensor description and extra attribute logic to handle diagnostic data.
homeassistant/components/roomba/entity.py	Introduced properties to extract and expose last command information from vacuum_state.

Files not reviewed (1)

• homeassistant/components/roomba/strings.json: Language not supported

[edenhaus]

We don't like to have this kind of entity, especially as that has a lot of arbitrary attributes.
Can you extend the diagnostic instead of creating a sensor entity and add the last command there instead?

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[Xeio]

Moved logic to be part of the diagnostic dump for the Roomba config entry