bugfix: Fix PcCollector for Scala 2 in anon-fun parameters

[jkciesluk]

Anonymous function parameters with type annotation have incorrect name position on definition, so we need to handle them separately.

Closes #5840 and #5837

[filipwiech]

If I understood it correctly, the #5837 contains a case where the cursor is positioned on the => inside the lambda. Would it make sense to add such scenario to the tests? 🙂

[jkciesluk]

If I understood it correctly, the #5837 contains a case where the cursor is positioned on the => inside the lambda. Would it make sense to add such scenario to the tests? 🙂

The issue was that

List(1).map {
  // position of `someVeryLongName` is at `<<>>`
  someVeryLongName<<: Int => someVer>>yLongName + 1 
}

Sure, I added the test

[tgodzik]

LGTM