loose unit test `atol` `rtol` tolerance to eliminate ut flakiness (#3… #534

Job	Run time
build-bazel	0s
build-linux	0s
build-macos (macos-13, static)	14m 57s
build-macos (macos-13, shared)	12m 20s
build-windows (windows-2022, static)	12m 30s
build-windows (windows-2022, shared)	12m 14s
	52m 1s

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