Prevent unmounting carried and carrying parts

[irwiss]

Summary

None

Purpose of change

Fixes #39457
Fixes #48154

Describe the solution

Prevent unmounting bike racks that carry parts.
Prevent unmounting parts that are carried.

Describe alternatives you've considered

Tried preventing unmounting on just the carrier parts, but this has it's own bugs for carried parts;

• racking a bike, then removing middle part of a bike (therefore slicing it) produces unracking task failed when unracking
• lifting requirements are wrong; try removing a wheel from said bike - it requires 22 str (or whatever parent vehicle mass requires), when it normally requires 2 str

Testing

Step 3 in fixed issue isn't allowed.
Any parts on racked vehicles shouldn't be removable until they're unracked

Additional context

[chrispikula]

Prevent unmounting bike racks that carry parts.
Prevent unmounting parts that are carried.

By this do you mean uninstalling things from the primary vehicle, or unmounting the entire bike, which may itself carry equipment?

'cause if it's the later, I'll be a bit say that my mobile welding bike is no more. :-(

[irwiss]

I mean you can't rack a bike and start sawing parts off of it
Or rack a bike and then saw off the racks you put it on

[chrispikula]

Yeah, I get that logic, it's just 'unmounting' is a multi-meaning word, and I am confused.

I could see the logic in preventing large things, like equipment, from going on bike racks. Or, heck, even impassible tile stuff. I just wouldn't really like it, as I currently use that 'exploit'.

[irwiss]

Unmounting in the sense of vehicle::*unmount*() functions, in my last few PRs I'm not doing bikerack balance pass, I'm just knocking out the weird edge case issues that currently make bikeracks "feel" unstable before digging into more serious bugs