K2: remove a workaround for suspend functions implementation status

This commit breaks two diagnostic tests:
- testSuspendJavaImplementationFromDifferentClass
- testSuspendJavaOverrides

Related to KT-59818
#KT-63233 Fixed

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/FirHelpers.kt

@@ -408,10 +408,6 @@ fun FirCallableSymbol<*>.getImplementationStatus(
             ) {
                 return ImplementationStatus.INHERITED_OR_SYNTHESIZED
             }
-            // TODO, KT-59818: suspend function overridden by a Java class in the middle is not properly regarded as an override
-            if (isSuspend) {
-                return ImplementationStatus.INHERITED_OR_SYNTHESIZED
-            }
         }
         is FirFieldSymbol -> if (symbol.isJavaOrEnhancement) return ImplementationStatus.CANNOT_BE_IMPLEMENTED
     }

compiler/testData/diagnostics/testsWithStdLib/coroutines/suspendNotImplemented.fir.kt

@@ -1,7 +0,0 @@
-// ISSUE: KT-63233, KT-59818
-
-interface A {
-    suspend fun foo()
-}
-
-class B : A

compiler/testData/diagnostics/testsWithStdLib/coroutines/suspendNotImplemented.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // ISSUE: KT-63233, KT-59818
 
 interface A {