[FIR/NI] Refactor type variable gathering from lambda types

Motivation:
- drop getArguments from type context as a duplicate of getArgumentList
- reduce the number of collection allocations in getAllDeeplyRelatedTypeVariables

Additional minor improvements, test data fixes

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/inference/components/ClassicConstraintSystemUtilContext.kt

@@ -63,7 +63,7 @@ class ClassicConstraintSystemUtilContext(
         return FixVariableConstraintPositionImpl(variable, atom) as FixVariableConstraintPosition<T>
     }
 
-    override fun extractParameterTypesFromDeclaration(declaration: PostponedAtomWithRevisableExpectedType): List<KotlinTypeMarker?>? {
+    override fun extractLambdaParameterTypesFromDeclaration(declaration: PostponedAtomWithRevisableExpectedType): List<KotlinTypeMarker?>? {
         require(declaration is ResolvedAtom)
         return when (val atom = declaration.atom) {
             is FunctionExpression -> {

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/inference/components/KotlinConstraintSystemCompleter.kt

@@ -20,10 +20,8 @@ import org.jetbrains.kotlin.utils.addToStdlib.safeAs
 class KotlinConstraintSystemCompleter(
     private val resultTypeResolver: ResultTypeResolver,
     val variableFixationFinder: VariableFixationFinder,
-    private val ctx: ConstraintSystemUtilContext,
+    private val postponedArgumentInputTypesResolver: PostponedArgumentInputTypesResolver,
 ) {
-    private val postponedArgumentInputTypesResolver = PostponedArgumentInputTypesResolver(resultTypeResolver, variableFixationFinder, ctx)
-
     fun runCompletion(
         c: ConstraintSystemCompletionContext,
         completionMode: ConstraintSystemCompletionMode,