[kotlin2cpg] Lambda capture fix (#8544)

[SuperUserDone]

This commit solves an issue where lambdas incorrectly capture variables that aren't used within the lambda. As an example, for the given code, the method parameter x and Bar.this are captured into the lambda. Only baz should be captured into the lambda.

package simple.pkg

class Bar {
    fun foo(x: String) {
        val baz: String = "BAZ"
        1.let { println(baz) }
    }
}

[ml86]

Here the unfiltered locals get added to the scope. I am no expert in the kt2cpg frontend either but this does not look right.

[SuperUserDone]

Will get back to you on this. AFIK this should not be an issue, as locals are not directly added from the scope to the cpg, but would need to dive deeper to confirm.