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Backend: bounded application cache with expiry and metrics #6465

Job	Run time
unity-gallery / Unity gallery prebuilt	26s
build suite classes (x64)	7m 35s
build + run suite (x64)	52m 21s
build + run suite (musl, Alpine x64)	35m 6s
build + run suite (arm64)	52m 18s
screenshot-comment	1s
	2h 27m 47s