Revert "[FE 1.0] Deprecate declaration of expect and actual in the same module"

This reverts commit b09561c3c3.

It was decided to postpone this warning till 1.9
This is needed to provide proper IDE support

^KT-40904 Open
^KT-55177 Open

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java

@@ -21228,12 +21228,6 @@ public class DiagnosisCompilerTestFE10TestdataTestGenerated extends AbstractDiag
                 KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("compiler/testData/diagnostics/tests/multiplatform"), Pattern.compile("^(.+)\\.kt$"), Pattern.compile("^(.+)\\.(fir|ll)\\.kts?$"), true);
             }
 
-            @Test
-            @TestMetadata("expectAndActualInSameModule.kt")
-            public void testExpectAndActualInSameModule() throws Exception {
-                runTest("compiler/testData/diagnostics/tests/multiplatform/expectAndActualInSameModule.kt");
-            }
-
             @Test
             @TestMetadata("expectDataObject.kt")
             public void testExpectDataObject() throws Exception {