Remove unused function escapeString #2019

Job	Run time
build (2_12, mima)	1m 13s
conformance	1m 27s
build (2_12, e2e)	8s
build (2_12, test)	11m 24s
build (2_13, mima)	1m 14s
build (2_13, e2e)	6s
build (2_13, test)	9m 0s
build (3, mima)	10s
build (3, e2e)	8s
build (3, test)	10m 3s
build (2_12, examples_and_formatting)	2m 33s
build (2_13, scala3_compat_test)	10m 23s
build (3, scala3_compat_test)	6m 45s
ci-passed	1s
	54m 35s

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