Add .kotlin to gitignore #329

Job	Run time
Test Processing	4m 7s
(linux/x64) Create Processing Build	10m 17s
(linux/aarch64) Create Processing Build	9m 35s
(windows/x64) Create Processing Build	5m 40s
(macos/x64) Create Processing Build	11m 54s
(macos/aarch64) Create Processing Build	5m 57s
	47m 30s

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