Fix false "Unnecessary parentheses" for function types in type patterns #SCL-21577

[jglodek]

What

Fixes SCL-21577: Wrong "Unnecessary parentheses" warning shown in type pattern with function literal

Problem

IntelliJ was incorrectly flagging parentheses around function types in type patterns as unnecessary:

null match {
  case _: (String => String) =>  // Parentheses ARE needed but were flagged as unnecessary
  case _ =>
}

Without the parentheses, the code would be parsed differently and wouldn't compile.

Solution

Extended the NeededParenthesisAroundFunctionalType check in ParenthesizedElement.scala to recognize that parentheses are necessary when:

• The parent is ScParameterType (already handled)
• OR the parent is ScTypePattern (newly added)

Testing

• Added test case testSCL21577_FunctionTypeInPattern in ScalaUnnecessaryParenthesesInspectionTest_Scala3
• Test verifies that parentheses around function types in type patterns are NOT flagged as unnecessary
• Test fails before the fix, passes after

Files Changed

• scala/scala-impl/src/org/jetbrains/plugins/scala/extensions/ParenthesizedElement.scala
• scala/scala-impl/test/org/jetbrains/plugins/scala/codeInspection/parentheses/ScalaUnnecessaryParenthesesInspectionTest.scala