Update test implementations for MultiRead with fs_scratch reuse #3575

Job	Run time
build-linux	16m 59s
build-linux-cmake-with-folly	27m 56s
check-format-and-targets	31s
build-linux-cmake-mingw	12m 28s
build-examples	10m 50s
build-fuzzers	8m 40s
build-linux-clang10-clang-analyze	17m 13s
build-linux-clang-13-no_test_run	7m 12s
build-linux-clang-no_test_run	11m 57s
build-linux-cmake-with-benchmark	19m 49s
build-linux-cmake-with-folly-coroutines	32m 3s
build-linux-cmake-with-folly-lite-no-test	7m 52s
build-linux-encrypted_env-no_compression	16m 5s
build-linux-gcc-10-cxx20-no_test_run	9m 38s
build-linux-gcc-8-no_test_run	8m 55s
build-linux-make-with-folly	28m 48s
build-linux-make-with-folly-lite-no-test	9m 39s
build-linux-mini-crashtest	30m 18s
build-linux-release-rtti	12m 48s
build-linux-release	14m 43s
build-linux-unity-and-headers	13m 18s
build-linux-clang10-asan	16m 59s
build-linux-clang10-mini-tsan	24m 21s
build-linux-clang10-ubsan	17m 13s
build-linux-gcc-11-no_test_run	10m 14s
build-linux-static_lib-alt_namespace-status_checked	19m 16s
build-macos	28m 14s
build-macos-cmake (true)	45m 37s
build-windows-vs2019	56m 35s
build-macos-cmake (false)	52m 2s
build-linux-arm	14m 32s
build-linux-java	15m 27s
build-linux-java-pmd	12m 17s
build-linux-java-static	11m 42s
build-macos-java	14m 7s
build-macos-java-static	24m 44s
build-macos-java-static-universal	19m 28s
	11h 40m 30s

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