Use common::findFile when searching for slip map in LookupWheelSlip system #283

Job	Run time
test / matrix-prep-os	3s
test / matrix-prep-bazelversion	7s
test / test (ubuntu-latest, 8.0.0, ., true)	13m 8s
test / test (ubuntu-latest, 7.3.1, ., true)	13m 7s
	26m 25s

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