KT-61890 [AA] Add testdata to ensure KDoc completion support in IDE

Completion in the IDE relies on correct scopes for KDoc positions.
So we add testData for `KtScopeProvider` and `ContextCollector`
to ensure that there are no regressions

analysis/low-level-api-fir/testData/contextCollector/wholeDeclaration_fun.kt

@@ -0,0 +1,8 @@
+package test
+
+class ContextReceiver
+
+class Receiver
+
+<expr>context(ContextReceiver)
+fun <T> Receiver.test(param: String): T {}</expr>