Reorganize diagnostics tests with stdlib and reflect

DiagnosticsTestWithStdLib now require stdlib only.
Move test data accordingly.
The only test that required kotlin-reflect is transformed into
codegen box test.

compiler/testData/diagnostics/testsWithStdLib/regression/kt9345.fir.kt

@@ -1,3 +0,0 @@
-//KT-9345 Type inference failure
-
-fun Class<*>.foo(): Any? = kotlin.<!UNRESOLVED_REFERENCE!>objectInstance<!>

compiler/testData/diagnostics/testsWithStdLib/regression/kt9345.kt

@@ -1,3 +0,0 @@
-//KT-9345 Type inference failure
-
-fun Class<*>.foo(): Any? = kotlin.objectInstance

compiler/testData/diagnostics/testsWithStdLib/regression/kt9345.txt

@@ -1,3 +0,0 @@
-package
-
-public fun java.lang.Class<*>.foo(): kotlin.Any?