[LL FIR] add tests on fir for full qualified name for nested classes

For some reason, outer Java class is treated as a package

^KT-62892

analysis/low-level-api-fir/testData/getOrBuildFir/types/nestedClassFromJava.kt

@@ -0,0 +1,15 @@
+// SKIP_WHEN_OUT_OF_CONTENT_ROOT
+// MODULE: dep
+// FILE: issue/pack/RowIcon.java
+package issue.pack;
+
+public class RowIcon {
+    public static class RClass {}
+}
+
+// MODULE: main(dep)
+// FILE: usage.kt
+package usage
+
+fun testJavaNestedClass(alignment: <expr>issue.pack.RowIcon.RClass</expr>) {
+}

analysis/low-level-api-fir/testData/getOrBuildFir/types/nestedClassFromJava.txt

@@ -0,0 +1,13 @@
+KT element: KtTypeReference
+FIR element: FirResolvedTypeRefImpl
+FIR source kind: KtRealSourceElementKind
+
+FIR element rendered:
+R|issue/pack/RowIcon/RClass|
+
+FIR FILE:
+FILE: [ResolvedTo(IMPORTS)] usage.kt
+    package usage
+
+    public final [ResolvedTo(ANNOTATION_ARGUMENTS)] fun testJavaNestedClass([ResolvedTo(ANNOTATION_ARGUMENTS)] alignment: R|issue/pack/RowIcon/RClass|): R|kotlin/Unit| {
+    }

analysis/low-level-api-fir/testData/getOrBuildFir/types/nestedClassFromKotlin.kt

@@ -0,0 +1,15 @@
+// SKIP_WHEN_OUT_OF_CONTENT_ROOT
+// MODULE: dep
+// FILE: issue/pack/RowIcon.kt
+package issue.pack;
+
+class RowIcon {
+    class RClass
+}
+
+// MODULE: main(dep)
+// FILE: usage.kt
+package usage
+
+fun testJavaNestedClass(alignment: <expr>issue.pack.RowIcon.RClass</expr>) {
+}

analysis/low-level-api-fir/testData/getOrBuildFir/types/nestedClassFromKotlin.txt

@@ -0,0 +1,13 @@
+KT element: KtTypeReference
+FIR element: FirResolvedTypeRefImpl
+FIR source kind: KtRealSourceElementKind
+
+FIR element rendered:
+R|issue/pack/RowIcon.RClass|
+
+FIR FILE:
+FILE: [ResolvedTo(IMPORTS)] usage.kt
+    package usage
+
+    public final [ResolvedTo(ANNOTATION_ARGUMENTS)] fun testJavaNestedClass([ResolvedTo(ANNOTATION_ARGUMENTS)] alignment: R|issue/pack/RowIcon.RClass|): R|kotlin/Unit| {
+    }