Deprecate SbUserGetSignedIn SB API #3898

Job	Run time
raspi-2 / initialize	47s
raspi-2-skia / initialize	36s
raspi-2-skia / docker-build-image	49s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / docker-build-image	26s
raspi-2 / docker-unittest-image	0s
raspi-2 / raspi_devel	8m 30s
raspi-2 / raspi_debug	10m 5s
raspi-2 / raspi_qa	7m 36s
raspi-2 / raspi_gold	7m 42s
raspi-2 / sbversion-13_devel	8m 48s
raspi-2 / sbversion-13_debug	11m 28s
raspi-2 / sbversion-13_qa	7m 59s
raspi-2 / sbversion-13_gold	8m 26s
raspi-2 / sbversion-14_devel	9m 39s
raspi-2 / sbversion-14_debug	11m 22s
raspi-2 / sbversion-14_qa	8m 24s
raspi-2 / sbversion-14_gold	7m 17s
raspi-2 / sbversion-15_devel	9m 15s
raspi-2 / sbversion-15_debug	9m 23s
raspi-2 / sbversion-15_qa	9m 31s
raspi-2 / sbversion-15_gold	7m 50s
raspi-2-skia / raspi-2-skia_devel	8m 26s
raspi-2-skia / raspi-2-skia_debug	9m 24s
raspi-2-skia / raspi-2-skia_qa	8m 5s
raspi-2-skia / raspi-2-skia_gold	8m 32s
raspi-2-skia / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
raspi-2-skia / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
raspi-2 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
	3h 0m 20s

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