[FIR] Properly handle nested annotations on compiler-required annotation phase

There was a case when we visited the same declaration multiple times
  because of forward-referencing and visiting with designation
So because of this there were two changes required:
- remove assertion about visiting the same declaration twice (it's fine
  since we don't actually resolve annotations twice)
- not skipping resolution of class children if annotations on this class
  are already resolved

^KT-61388 Fixed
KT-62854

compiler/fir/analysis-tests/testData/resolve/annotations/kindaCompilerRequiredNestedAnnotation.kt

@@ -0,0 +1,13 @@
+// ISSUE: KT-61388
+// FILE: a.kt
+@SinceKotlin
+class Some
+
+// FILE: b.kt
+@SinceKotlin.SinceKotlin
+class Other
+
+// FILE: SinceKotlin.kt
+annotation class SinceKotlin {
+    annotation class SinceKotlin
+}