Cleanup root build.gradle.kts. Remove duplicate dependency

[maksym-moroz]

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Description

• Register tasks instead of creating them eagerly to improve configuration times
• Use onlyIf predicate block to run qa task conditionally
• Remove duplicate dependency on kotlinx.collections.immutable

[greyson-signal]

Mostly good! We can't use onlyIf -- seems like the project fails to configure. I'm no gradle expert, but the documentation suggests that it's likely because onlyIf prevents execution of the task, but the error itself is happening during configuration because it can't find the lint task on the benchmark project. So we need to prevent the task being registered at all if those conditions aren't met.

So I reverted that little bit, but the rest will be in the 6.46 release. Thank you!

[maksym-moroz]

Makes sense. I will look into onlyIf in more detail later. Thanks for swift response!