Restore 'ignore volume reports' setting for AirPlay players

[MarvinSchenkel]

What does this implement/fix?

PR #3210 accidentally replaced the "Ignore volume reports sent by the device itself" config entry with the new latency entry in get_config_entries, so the setting disappeared from the UI while the backend still honors it. This restores the config entry (advanced, generic protocol category).

• Restore the ignore_volume ConfigEntry with its original label/description
• The entry is no longer RAOP-only: the original TODO to drop the depends_on once AirPlay2 gained DACP support is now fulfilled, and volume feedback reaches update_volume_from_device for both protocols
• Add a regression test asserting the entry is present in the player config entries

Related issue: music-assistant/support#5603

Types of changes

• Bugfix (non-breaking change which fixes an issue) — bugfix
• New feature (non-breaking change which adds functionality) — new-feature
• Enhancement to an existing feature — enhancement
• New music/player/metadata/plugin provider — new-provider
• Breaking change (fix or feature that would cause existing functionality to not work as expected) — breaking-change
• Refactor (no behaviour change) — refactor
• Documentation only — documentation
• Maintenance / chore — maintenance
• CI / workflow change — ci
• Dependencies bump — dependencies

Checklist

• The code change is tested and works locally.
• pre-commit run --all-files passes.
• pytest passes, and tests have been added/updated under tests/ where applicable.
• For changes to shared models, the companion PR in music-assistant/models is linked.
• For changes affecting the UI, the companion PR in music-assistant/frontend is linked.
• I have read and complied with the project's AI Policy for any AI-assisted contributions.
• I have raised a PR against the documentation repository targeting the main or beta branch as appropriate.

[Copilot]

Pull request overview

Restores the missing AirPlay player setting “Ignore volume reports sent by the device itself” in get_config_entries, ensuring the UI again exposes a backend-supported option and adding a regression test to prevent future removal.

Changes:

• Re-add CONF_IGNORE_VOLUME as an advanced “protocol_generic” player config entry for AirPlay players.
• Keep volume-report ignoring applicable regardless of RAOP vs AirPlay2 (no longer RAOP-only in config UI).
• Add a regression test asserting the config entry is present in AirPlayPlayer.get_config_entries().

Reviewed changes

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

File	Description
music_assistant/providers/airplay/player.py	Restores the ignore_volume ConfigEntry in the AirPlay player configuration entries.
tests/providers/airplay/test_player.py	Adds a regression test verifying the ignore_volume config entry is included.