Copter: pre-arm check that throttle is high should be skipped if arming in Auto

[rmackay9]

AP_Arming_Copter::arm_checks() skips over the pilot's throttle position checks if arming in Guided mode from a GCS. I think we can also skip these checks if the vehicle is arming in Auto mode. See code here.

[agising]

Thumbs up, I want this feature. Actually in my checklist I have 'throttel to mid-stick" prior to gcs takeoff

[magicrub]

looks like @prathamesh7255 has a fix for this in PR https://github.com/ArduPilot/ardupilot/pull/22676

[khancyr]

We got to PR that are the same and work, but it need some param change : AUTO_OPTIONS 1 to allow arming RC_OPTIONS 32 to disable throttle arming check on RC lib.

[rmackay9]

Opps, @khancyr you think the earlier PR isn't sufficient?

[khancyr]

It is needed but that isn't enough on its own as the rc_options check will trigger but that is just param so the PR was good