feat: update the constraints & remove financing columns

[TonybynMp4]

Description

Related to Qbox-project/qbx_vehicleshop#64
Also fixes potential issues with conflicting charsets / collate

Checklist

• I have personally loaded this code into an updated Qbox project and checked all of its functionality.
• My pull request fits the contribution guidelines & code conventions.

[Manason]

We should consider how many scripts will break that would be accessing this table directly for finance data. Doing this may prevent other vehicle shop resources from being compatible with qbox. We may want to hold off on this for now. What do you think?

[TonybynMp4]

We should consider how many scripts will break that would be accessing this table directly for finance data. Doing this may prevent other vehicle shop resources from being compatible with qbox. We may want to hold off on this for now. What do you think?

Considering vehicleshop had the sql for it, i'd assume they also have it anyway.
qbx_vehicles should not have the vehicleshop db stuff, just like vehicleshop shouldn't have the vehicles table, if it breaks, it's the responsibility of the script creator to maintain compatibility and not ours.