[FIR] Do not include transitive friend dependencies in symbol provider

When flattening a dependency FirSymbolProvider, make sure transitive
dependency FirSymbolProviders are not included. This requires checking
that nested symbol provider sessions match the composite symbol provider
session when they are both source sessions.

^KT-60614 Fixed

compiler/testData/diagnostics/tests/multimodule/friendModule.fir.kt

@@ -0,0 +1,53 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+// MODULE: m1
+// FILE: a.kt
+
+package p
+
+public class A {
+    internal val a = A()
+    internal var v = A()
+    internal fun a() = A()
+    internal inner class B
+}
+
+internal val a = A()
+internal var v = A()
+internal fun a() = A()
+internal class B
+
+// MODULE: m2()(m1)
+// FILE: b.kt
+
+import p.*
+
+fun test() {
+    val _a = a
+    val _v = v
+    a()
+    B()
+
+    val inst = A()
+    val ia = inst.a
+    val iv = inst.v
+    inst.a()
+    inst.B()
+}
+
+// MODULE: m3()(m2)
+// FILE: c.kt
+
+import <!UNRESOLVED_IMPORT!>p<!>.*
+
+fun test3() {
+    val _a = <!UNRESOLVED_REFERENCE!>a<!>
+    val _v = <!UNRESOLVED_REFERENCE!>v<!>
+    <!UNRESOLVED_REFERENCE!>a<!>()
+    <!UNRESOLVED_REFERENCE!>B<!>()
+
+    val inst = <!UNRESOLVED_REFERENCE!>A<!>()
+    val ia = inst.a
+    val iv = inst.v
+    inst.a()
+    inst.B()
+}