All 15 and 20A 120V receptacles in a garage MUST be GFCI protected.

There's nothing that says garage circuits can't be shared with other things. There are certain circuits that serve receptacles that are barred from being shared: kitchen, bath, laundry. Other circuits are fair game for sharing (look for the words "no other outlets" in the code).

The requirement for GFCI is found in Art. 210.8.

The requirements on circuit sharing is found in 210.52.

I see no problem with putting the receptacles and lighting on the same circuit.

However, will your existing panel accept tandem breakers?

Yes, lighting and receptacles go on the same circuit all the time. Again, it's restricted only in places like the bathroom, kitchen, and laundry.

One thing though, if you have a circuit you're frequently tripping, I'd avoid putting the sole lighting for the room on it :)

Lets say you have only one circuit in a garage. What about putting the lighting wiring before the GFCI receptacle and all the rest of the receptacles downstream from that?

I’m adding one of the circuits to prevent tripping from the miter saw, I actually only recently realized it’s on the same circuit as the internet router and other home electronic hardware and it’s easier to add another circuit rather than relocate any of those things. Hopefully it will resolve the breaker tripping