[FIR] Properly assign <local> packages to symbols

This prevents `FirConflictsExpressionChecker.kt`
from missing conflicting local functions. It used
to due to inconsistencies in assigning `<local>`,
and this commit makes it a bit more
straightforward.

The change in KtClassTypeQualifierRenderer
prevents `FirOverrideImplementTest.testLocalClass`
from failing in `intellij`. It didn't fail for
callables, because `KtCallableSignatureRenderer`
doesn't try to render packages.

^KT-59186 Fixed

compiler/fir/analysis-tests/testData/resolve/expresssions/localInnerClass.fir.txt

@@ -12,7 +12,7 @@ FILE: localInnerClass.kt
             }
 
             local final inner class Derived : R|Foo| {
-                public <anonymous>.constructor(x: R|kotlin/Int|): R|<anonymous>.Derived| {
+                public <anonymous>.constructor(x: R|kotlin/Int|): R|<local>/<anonymous>.Derived| {
                     super<R|kotlin/Any|>()
                 }