Add claude to gitignore #2813

Job	Run time
conformance	1m 39s
build (2_12, mima)	1m 17s
build (2_12, e2e)	3m 10s
build (2_12, test)	12m 35s
build (2_13, mima)	1m 21s
build (2_13, test)	9m 34s
build (2_12, examples_and_formatting)	2m 32s
build (3, scala3_compat_test)	8m 22s
build (3, mima)	6s
build (2_13, e2e)	3m 49s
build (3, test)	8m 22s
build (2_13, scala3_compat_test)	7m 26s
build (3, e2e)	4m 4s
ci-passed	3s
	1h 4m 20s

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