[MPP][Test] Implement Diagnostics with mpp composite analysis tests

Using the 'MULTIPLATFORM_COMPOSITE_ANALYSIS_MODE' test directive
will add support for testing "cli metadata compilation" and
"ide analysis" _like_ configurations. In this configuration,
dependsOn modules will not be analyzed together with dependents in
the same ModuleDescriptor, but will be passed as separate 'expectedBy'
dependency descriptor.

Used to cover ^KT-50120 inside kotlin.git

compiler/tests-for-compiler-generator/tests/org/jetbrains/kotlin/test/generators/GenerateJUnit5CompilerTests.kt

@@ -47,6 +47,13 @@ fun generateJUnit5CompilerTests(args: Array<String>) {
                 model("diagnostics/nativeTests")
             }
 
+            testClass<AbstractDiagnosticsWithMultiplatformCompositeAnalysisTest> {
+                model(
+                    "diagnostics/testsWithMultiplatformCompositeAnalysis",
+                    pattern = "^(.*)\\.kts?$", excludedPattern = excludedFirTestdataPattern
+                )
+            }
+
             testClass<AbstractForeignAnnotationsSourceJavaTest> {
                 model("diagnostics/foreignAnnotationsTests/tests", excludedPattern = excludedFirTestdataPattern)
                 model("diagnostics/foreignAnnotationsTests/java8Tests", excludedPattern = excludedFirTestdataPattern)