Add --emulators option to explicitly choose to detect emulators in enumeration and device auto detection #50

Job	Run time
Non-device tests	38s
Dist builder	4m 46s
bitcoind builder	18m 49s
Ledger App builder	1m 27s
lint	35s
Sim builder (trezor-1, trezor-firmware, test/work/trezor-firmware)	6m 25s
Type check	35s
Sim builder (trezor-t, trezor-firmware, test/work/trezor-firmware)	2m 24s
Sim builder (coldcard, coldcard-mpy, test/work/firmware/external/micropython/ports/unix/coldcard-...	8m 35s
Wine builder	5m 27s
Sim builder (bitbox01, mcu, test/work/mcu)	42s
Sim builder (jade, jade, test/work/jade/simulator)	7m 53s
Sim builder (ledger, speculos, test/work/speculos)	2m 2s
Sim builder (keepkey, keepkey-firmware, test/work/keepkey-firmware/bin)	2m 40s
Python ${{ matrix.python-version }} ${{ matrix.device }} ${{ matrix.interface }}	0s
Python ${{ matrix.python-version }} ${{ matrix.device }} ${{ matrix.script.name }}	0s
	1h 2m 58s

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