KT-59732 [FIR] Adjust test data for the absence of unresolved imports

Now there are no real unresolved imports - all imports are considered
resolved starting from the IMPORTS phase and until they are proven
otherwise in the checkers.

Because of that, some `UNRESOLVED_REFERENCE` diagnostics are gone -
in the cases when such references were actually resolved through
those unsupported imports.

The compilation of incorrect files should not be affected by this,
the checkers would still prevent the compilation of the files with
incorrect imports.
But now the references to the declarations from such imports no longer
will be highlighted as unresolved references.

analysis/low-level-api-fir/testData/getOrBuildFir/inImport/middleImportNamePartScript.txt

@@ -1,5 +1,5 @@
 KT element: KtNameReferenceExpression
-FIR element: FirImportImpl
+FIR element: FirResolvedImportImpl
 FIR source kind: KtRealSourceElementKind
 
 FIR element rendered: