fix minor ticks

[SimonDanisch]

#1968 broke minor ticks + grids:

This should fix it and add a reference image test for it.

[MakieBot]

Compile Times benchmark

Note, that these numbers may fluctuate on the CI servers, so take them with a grain of salt.

using time

master:  10.20 < 10.35 > 10.71, 0.21+-
pr:      10.19 < 10.31 > 10.49, 0.10+-
speedup: 0.98 < 1.00 > 1.05, 0.03+-
median:  -0.40% => invariant

This PR does not change the using time.

ttfp time

master   29.87 < 30.11 > 30.74, 0.30+-
pr       29.73 < 29.99 > 30.89, 0.40+-
speedup: 0.97 < 1.01 > 1.02, 0.02+-
median:  -0.39% => invariant

This PR does not change the ttfp time.

[jkrumbiegel]

I still have the feeling that there are double updates in there but I'm not motivated right now to go in again and check. Such a time sink

[SimonDanisch]

Yeah, there still are definitely lots ^^ Lets pick this up again once we have a better idea of how we want to handle observables.