[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/resolveWithStdlib/contracts/fromSource/bad/callsInPlace/inLocalClass.fir.txt

@@ -27,13 +27,13 @@ FILE: inLocalClass.kt
             public final val leaked: R|kotlin/Any|
                 public get(): R|kotlin/Any|
 
-            public constructor(): R|LocalClass| {
+            public constructor(): R|<local>/LocalClass| {
                 super<R|kotlin/Any|>()
                 R|<local>/b|.R|SubstitutionOverride<kotlin/Function0.invoke: R|kotlin/Unit|>|()
             }
 
             init {
-                this@R|/LocalClass|.R|<local>/leaked| = R|<local>/c|
+                this@R|<local>/LocalClass|.R|<local>/leaked| = R|<local>/c|
             }
 
             public final fun run(): R|kotlin/Unit| {