fix(game/five): check for vehicle type on drawhandler shader access

[slashkeyvalue]

Goal of this PR

Addresses a crash caused by the game wrongfully assuming that every entity/fragment that uses a model of type 'vehicle' is parented by a vehicle ( in which the entity would have a valid vehicle shader )

How is this PR achieving the goal

Add proper validation for vehicle shader access

This PR applies to the following area(s)

FiveM

Successfully tested on

Game builds: 3095, 3258

Platforms: Windows

Checklist

• Code compiles and has been tested successfully.
• Code explains itself well and/or is documented.
• My commit message explains what the changes do and what they are for.
• No extra compilation warnings are added by these changes.

Fixes issues