[EG] Update the EG updater to allow sideloading #15050

Job	Run time
raspi-2 / initialize	47s
raspi-2-skia / initialize	47s
raspi-2-skia / docker-build-image	1m 31s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / docker-build-image	1m 35s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / raspi-2-skia_devel	10m 45s
raspi-2-skia / raspi-2-skia_debug	14m 3s
raspi-2-skia / raspi-2-skia_qa	8m 45s
raspi-2-skia / raspi-2-skia_gold	8m 28s
raspi-2 / raspi_devel	10m 24s
raspi-2 / raspi_debug	14m 27s
raspi-2 / raspi_qa	8m 45s
raspi-2 / raspi_gold	8m 30s
raspi-2 / sbversion-15_devel	11m 0s
raspi-2 / sbversion-15_debug	13m 32s
raspi-2 / sbversion-15_qa	8m 56s
raspi-2 / sbversion-15_gold	8m 33s
raspi-2 / sbversion-16_devel	10m 32s
raspi-2 / sbversion-16_debug	13m 58s
raspi-2 / sbversion-16_qa	9m 32s
raspi-2 / sbversion-16_gold	8m 34s
raspi-2 / sbversion-17_devel	19m 19s
raspi-2 / sbversion-17_debug	13m 47s
raspi-2 / sbversion-17_qa	8m 34s
raspi-2 / sbversion-17_gold	8m 58s
raspi-2-skia / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2-skia / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
	3h 44m 2s

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