Do not suggest methods from nested interfaces #1418 (#1450)

Do not suggest methods from nested interfaces

Co-authored-by: Vassiliy Kudryashov <vassiliy.kudryashov@gmail.com>

Author: volivan239

utbot-intellij/src/main/kotlin/org/utbot/intellij/plugin/util/PsiClassHelper.kt

@@ -37,7 +37,7 @@ private val PsiMember.isKotlinAutogeneratedMethod: Boolean
     get() = this is KtLightMethod && navigationElement is KtClass
 
 private val PsiMethod.canBeCalledStatically: Boolean
-    get() = isStatic || containingClass?.isStatic ?: throw IllegalStateException("No containing class found for method $this")
+    get() = isStatic || containingClass?.let { it.isStatic && !it.isInterface && !it.isAbstract } ?: throw IllegalStateException("No containing class found for method $this")
 
 private val PsiMethod.isUntestableMethodOfAbstractOrInterface: Boolean
     get() {