Fix orphaned files in SstFileManager #2773

Job	Run time
build-linux-cmake-with-folly	27m 23s
check-format-and-targets	22s
build-linux-cmake-mingw	12m 3s
build-linux	16m 46s
build-linux-cmake-with-benchmark	18m 49s
build-linux-cmake-with-folly-coroutines	31m 26s
build-linux-cmake-with-folly-lite-no-test	7m 51s
build-linux-encrypted_env-no_compression	15m 31s
build-linux-make-with-folly	27m 51s
build-linux-make-with-folly-lite-no-test	9m 6s
build-linux-release	15m 5s
build-examples	10m 39s
build-fuzzers	8m 24s
build-linux-clang10-asan	16m 50s
build-linux-clang10-clang-analyze	17m 10s
build-linux-clang10-mini-tsan	23m 55s
build-linux-clang10-ubsan	16m 22s
build-linux-clang-13-no_test_run	7m 10s
build-linux-clang-no_test_run	11m 40s
build-linux-gcc-10-cxx20-no_test_run	9m 20s
build-linux-gcc-11-no_test_run	9m 54s
build-linux-gcc-8-no_test_run	8m 36s
build-linux-mini-crashtest	28m 40s
build-linux-release-rtti	12m 21s
build-linux-static_lib-alt_namespace-status_checked	18m 50s
build-linux-arm	14m 12s
build-linux-unity-and-headers	12m 44s
build-linux-java	15m 16s
build-linux-java-pmd	11m 40s
build-linux-java-static	11m 36s
build-macos	15m 37s
build-macos-cmake (true)	43m 19s
build-macos-cmake (false)	41m 32s
build-macos-java	13m 5s
build-macos-java-static	22m 59s
build-macos-java-static-universal	18m 16s
build-windows-vs2019	53m 2s
	10h 55m 22s

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