Add 'Reformat with scalafmt 3.9.10' to .git-blame-ignore-revs #1539

Job	Run time
conformance	1m 53s
build (2_12, e2e)	3m 11s
build (2_12, mima)	1m 23s
build (3, test)	12m 11s
build (2_12, test)	13m 3s
build (2_13, test)	11m 58s
build (2_13, mima)	1m 36s
build (2_13, e2e)	4m 9s
build (2_12, examples_and_formatting)	1m 44s
build (2_13, scala3_compat_test)	5m 31s
build (3, e2e)	4m 23s
build (3, mima)	1s
build (3, scala3_compat_test)	44m 31s
ci-passed	0s
	1h 45m 34s

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