RDKTV-26826: Unmount the dynamic mounts instead of removing #40

Job	Run time
Build in Release Mode (RUN_TESTS)	2m 26s
Build in Release Mode (-DLEGACY_COMPONENTS=ON)	1m 45s
Build in Release Mode (-DLEGACY_COMPONENTS=OFF)	1m 47s
Build in Release Mode (-DUSE_SYSTEMD=ON)	1m 55s
Build in Release Mode (-DUSE_SYSTEMD=OFF)	2m 39s
Build in Release Mode (-DDOBBY_HIBERNATE_MEMCR_IMPL=ON)	2m 30s
Build in Release Mode (-DDOBBY_HIBERNATE_MEMCR_IMPL=OFF)	2m 3s
Build in Debug Mode (RUN_TESTS)	3m 8s
Build in Debug Mode (-DLEGACY_COMPONENTS=ON)	2m 59s
Build in Debug Mode (-DLEGACY_COMPONENTS=OFF)	1m 35s
Build in Debug Mode (-DUSE_SYSTEMD=ON)	2m 10s
Build in Debug Mode (-DUSE_SYSTEMD=OFF)	1m 32s
Build in Debug Mode (-DDOBBY_HIBERNATE_MEMCR_IMPL=ON)	1m 30s
Build in Debug Mode (-DDOBBY_HIBERNATE_MEMCR_IMPL=OFF)	1m 29s
	29m 28s

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