Test

Remove all code related to `icon_mipmaps` #1497

Job	Run time
Push / Generate strategy matrix	23s
Push / CrashTest PyAl	28s
Push / CrashTest PyAl, PyHT	33s
Push / CrashTest PyAE	30s
Push / TechTree ${{ matrix.name }}	0s
Push / Discord Notification	5s
	1m 59s

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