Fix default positioning strategy handling

that causes flaky tests because the default positioning strategy
was dependent on the order of the reported messages.
The code led to it was introduced in an attempt to extract common
PSI-independent strategy because PSI is leaking into the abstract
diagnostic infrastructure. The approach is definitely problematic,
but to fix it now, the leaking dependency to the psi-based module
is introduced. This should be fixed in the future by introducing
better abstractions.
Fixes flaky tests touched in the commit.
#KT-63002 fixed

compiler/testData/diagnostics/tests/annotations/AnnotatedErrorTypeRef.fir.kt

@@ -1,11 +0,0 @@
-// ISSUE: KT-62447, KT-62628
-// FIR_DUMP
-
-fun main() {
-    val x: <!SYNTAX, WRONG_ANNOTATION_TARGET!>@SinceKotlin("2.0")<!><!SYNTAX!><!>
-}
-
-@Target(AnnotationTarget.TYPE)
-annotation class Anno
-
-val prop: @Anno <!UNRESOLVED_REFERENCE!>Foo<!>? = null

compiler/testData/diagnostics/tests/annotations/AnnotatedErrorTypeRef.fir.txt

@@ -1,4 +1,4 @@
-FILE: AnnotatedErrorTypeRef.fir.kt
+FILE: AnnotatedErrorTypeRef.kt
     public final fun main(): R|kotlin/Unit| {
         lval x: @R|kotlin/SinceKotlin|(version = String(2.0)) <ERROR TYPE REF: Incomplete code>
     }

compiler/testData/diagnostics/tests/annotations/AnnotatedErrorTypeRef.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // ISSUE: KT-62447, KT-62628
 // FIR_DUMP