Add support for `build.mill` and `build.mill.scala` #2820

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Run time

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Job	Run time
Extension test	1m 0s
Test (ubuntu-latest)	38s
Prettier	24s
Build	31s
Test (windows-latest)	1m 36s
Test (macos-latest)	51s
Eslint	15s
Typecheck	20s
	5m 35s