Add test cases for cobalt::loader::FetcherCache #6367

Job	Run time
raspi-2 / initialize	34s
raspi-2-skia / initialize	34s
raspi-2-skia / docker-build-image	1m 14s
raspi-2-skia / docker-unittest-image	0s
raspi-2 / docker-build-image	1m 13s
raspi-2 / docker-unittest-image	0s
raspi-2-skia / raspi-2-skia_devel	7m 45s
raspi-2-skia / raspi-2-skia_debug	10m 56s
raspi-2-skia / raspi-2-skia_qa	6m 48s
raspi-2-skia / raspi-2-skia_gold	6m 49s
raspi-2 / raspi_devel	7m 42s
raspi-2 / raspi_debug	11m 39s
raspi-2 / raspi_qa	7m 42s
raspi-2 / raspi_gold	6m 41s
raspi-2 / sbversion-15_devel	8m 25s
raspi-2 / sbversion-15_debug	11m 40s
raspi-2 / sbversion-15_qa	7m 22s
raspi-2 / sbversion-15_gold	7m 24s
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
	1h 44m 28s

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