[FIR] fix resolution ambiguities between weakly compatible expect and actual

There is a corresponding example inside the stdlib,
see `kotlin.text.startsWith`.

JVM and common counterpart are weakly-compatible
as the actual declaration has default arguments,
which results in `ExpectActualCompatibility.Incompatible.ActualFunctionWithDefaultParameters`

This commit allows such cases.

^KT-61732 fixed

compiler/testData/diagnostics/tests/multiplatform/callConflictsOnExpectAndActualWeaklyCompatible.fir.kt

@@ -0,0 +1,33 @@
+// ISSUE: KT-61732
+// based on of kotlin.text.startsWith from kotlin-stdlib
+
+// MODULE: common
+// TARGET_PLATFORM: Common
+// FILE: common.kt
+
+expect fun String.foo(prefix: String, ignoreCase: Boolean = false): Boolean
+
+expect fun String.foo(prefix: String, startIndex: Int, ignoreCase: Boolean = false): Boolean
+
+// MODULE: jvm()()(common)
+// TARGET_PLATFORM: JVM
+// FILE: jvm.kt
+
+
+@Suppress(<!ERROR_SUPPRESSION!>"ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS"<!>)
+actual fun String.foo(prefix: String, ignoreCase: Boolean = false): Boolean {
+    return true
+}
+
+@Suppress(<!ERROR_SUPPRESSION!>"ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS"<!>)
+actual fun String.foo(prefix: String, startIndex: Int, ignoreCase: Boolean = false): Boolean {
+    return true
+}
+
+// MODULE: client(jvm)()()
+// TARGET_PLATFORM: JVM
+// FILE: client.kt
+
+fun main() {
+    "".foo("")
+}

compiler/testData/diagnostics/tests/multiplatform/callConflictsOnExpectAndActualWeaklyCompatible.kt

@@ -0,0 +1,33 @@
+// ISSUE: KT-61732
+// based on of kotlin.text.startsWith from kotlin-stdlib
+
+// MODULE: common
+// TARGET_PLATFORM: Common
+// FILE: common.kt
+
+expect fun String.foo(prefix: String, ignoreCase: Boolean = false): Boolean
+
+expect fun String.foo(prefix: String, startIndex: Int, ignoreCase: Boolean = false): Boolean
+
+// MODULE: jvm()()(common)
+// TARGET_PLATFORM: JVM
+// FILE: jvm.kt
+
+
+@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
+actual fun String.foo(prefix: String, ignoreCase: Boolean = false): Boolean {
+    return true
+}
+
+@Suppress("ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS")
+actual fun String.foo(prefix: String, startIndex: Int, ignoreCase: Boolean = false): Boolean {
+    return true
+}
+
+// MODULE: client(jvm)()()
+// TARGET_PLATFORM: JVM
+// FILE: client.kt
+
+fun main() {
+    "".foo("")
+}