Cherry pick PR #1832: Add test cases for cobalt::loader::FetcherCache #1986

Job	Run time
android-arm64 / initialize	1m 6s
android-arm / initialize	35s
android-x86 / initialize	32s
android-x86 / docker-build-image	28s
android-x86 / docker-unittest-image	0s
android-arm / docker-build-image	30s
android-arm / docker-unittest-image	0s
android-arm64 / docker-build-image	25s
android-arm64 / docker-unittest-image	0s
android-x86 / x86_devel	19m 13s
android-x86 / x86_debug	17m 14s
android-x86 / x86_qa	8m 7s
android-x86 / x86_gold	12m 30s
android-arm / arm_devel	18m 31s
android-arm / arm_debug	23m 50s
android-arm / arm_qa	8m 4s
android-arm / arm_gold	8m 22s
android-arm64 / arm64_devel	18m 57s
android-arm64 / arm64_debug	18m 26s
android-arm64 / arm64_qa	8m 22s
android-arm64 / arm64_gold	7m 49s
android-x86 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-x86 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-x86 / on-host-unit-test-report	0s
android-arm64 / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm64 / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-arm64 / on-host-unit-test-report	0s
android-arm / ${{ matrix.name }}_${{ matrix.shard }}_test	0s
android-arm / ${{ matrix.name }}_on_device_${{ matrix.shard }}	0s
android-arm / on-host-unit-test-report	0s
upload-release-artifacts	28s
	2h 53m 29s

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