chore: minor refactors #5086

Job	Run time
sbt plugin integration tests (windows-latest)	6m 59s
Mill plugin integration tests (windows-latest)	4m 20s
Mill plugin integration tests (ubuntu-latest)	2m 4s
Test formatting	34s
Test on JDK 17 (windows-latest)	4m 34s
Test on JDK 17 (ubuntu-latest)	3m 7s
Test on JDK 25 (windows-latest)	3m 43s
Test Maven plugin	2m 29s
Test on JDK 25 (ubuntu-latest)	2m 20s
sbt plugin integration tests (ubuntu-latest)	4m 31s
release	0s
	34m 41s

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