Tests: move more diagnostic tests to testsWithJvmBackend

In this commit, tests where backend diagnostics were reported correctly
are being moved.

FirScopeDumpHandler was added to FIR diagnostic tests with JVM backend
to support `SCOPE_DUMP` in `overridesBuiltinNoMagic.kt` and
`charAtAndOverload.kt`.

compiler/testData/diagnostics/tests/overload/ConflictingOverloadsIdenticalFunsTPInClass.fir.kt

@@ -1,4 +0,0 @@
-class Aaa() {
-    fun f() = 1
-    fun <P> f() = 1
-}

compiler/testData/diagnostics/tests/overload/ConflictingOverloadsIdenticalFunsTPInClass.kt

@@ -1,4 +0,0 @@
-class Aaa() {
-    <!CONFLICTING_JVM_DECLARATIONS!>fun f()<!> = 1
-    <!CONFLICTING_JVM_DECLARATIONS!>fun <P> f()<!> = 1
-}

compiler/testData/diagnostics/tests/overload/ConflictingOverloadsIdenticalFunsTPInClass.txt

@@ -1,10 +0,0 @@
-package
-
-public final class Aaa {
-    public constructor Aaa()
-    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public final fun f(): kotlin.Int
-    public final fun </*0*/ P> f(): kotlin.Int
-    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-}