VU: Run sync ahead on small blocks & Rework VU Kickstart

[refractionpcsx2]

Description of Changes

Attempt to run the VU (VU0 mainly) ahead if it's only running a small block, to try and reduce overhead.
VU Kickstart is now always on and is replaced with a VU Sync option as less games need the sync than the run ahead.

Rationale behind Changes

Running blocks of like 3 cycles is very inefficient when you factor in entering and exiting a recompiler, so this makes sure at least a more reasonable amount of cycles is run.

Suggested Testing Steps

test games, compare to master.

Some preliminary numbers:
Tekken Tag: 80-82 to 82-84
Ratchet & Clank: 102-105 to 110-113
Mike Tyson Heavyweight Boxing: 100 to 102
Ratchet & Clank 3: 75 to 82
Jak 3: 118 to 120

Mixed with #5571 (which has now been rebased in) Ratchet & Clank has gone from 105fps to 122fps at the beginning of the first level, a nice little boost, so these two PR's bring a combined boost of somewhere between 10-20% in a bunch of games.

NOTE: This will NOT affect all games, you have to be EE thread limited and the game has to be VU0 heavy (which isn't a great deal) for it to have much effect, so in most scenarios you probably won't even notice a difference.

[refractionpcsx2]

Blown the scope of this PR out of the water and reworked VU Kickstart to always be on and added a new VUSync option for the games which don't like it, since there's only a handful of games, instead of 222 entries for kickstart.