[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/localClasses/overrideInLocal.fir.txt

@@ -1,7 +1,7 @@
 FILE: a.kt
     public final fun main(): R|kotlin/Unit| {
         local final class Local : R|B| {
-            public constructor(): R|Local| {
+            public constructor(): R|<local>/Local| {
                 super<R|B|>()
             }