Polish Kotlin DSL addFilterBefore to use reified type parameter

[jyx-07]

Fixes #17993

Update addFilterBefore extension function parameter type from Filter to T
to ensure type safety and maintain consistency with the reified type parameter in Kotlin DSL.

Before:

inline fun <reified T : Filter> addFilterBefore(filter: Filter) {
    this.addFilterBefore(filter, beforeFilter = T::class.java)
}

After:

inline fun <reified T : Filter> addFilterBefore(filter: T) {
    this.addFilterBefore(filter, beforeFilter = T::class.java)
}
```****

[jzheaux]

Thanks for the contribution, @jyx-07. I'm closing this in favor of #18967, please see #17993 (comment) for why I feel like this isn't the right move.