refactor(core): simplify fonts handling #2732

Job	Run time
Emulator (universal, debuglink, x86_64, noasan)	3m 32s
Emulator (btconly, debuglink, x86_64, noasan)	3m 11s
Firmware (universal, debuglink)	3m 53s
Firmware (btconly, debuglink)	4m 2s
Emulator arm	0s
Post comment with UI diff URLs	13s
Device test (universal, noasan)	8m 55s
Device test (btconly, noasan)	4m 52s
Upgrade test (noasan)	4m 13s
Upload emulator binaries	0s
HWI test	0s
UI diff from main branch	2m 21s
	35m 12s

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