Remove FirOperation.RANGE which was effectively unused

Associated KtTokens.RANGE is included into convention call table

compiler/fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/ConversionUtils.kt

@@ -162,7 +162,6 @@ internal fun IElementType.toFirOperation(): FirOperation =
         KtTokens.EXCLEQEQEQ -> FirOperation.NOT_IDENTITY
         KtTokens.IN_KEYWORD -> FirOperation.IN
         KtTokens.NOT_IN -> FirOperation.NOT_IN
-        KtTokens.RANGE -> FirOperation.RANGE
 
         KtTokens.EQ -> FirOperation.ASSIGN
         KtTokens.PLUSEQ -> FirOperation.PLUS_ASSIGN

compiler/fir/tree/src/org/jetbrains/kotlin/fir/expressions/FirOperation.kt

@@ -9,7 +9,6 @@ import java.util.*
 
 enum class FirOperation(val operator: String = "???") {
     // Binary
-    RANGE(".."),
     EQ("=="),
     NOT_EQ("!="),
     IDENTITY("==="),