Fix manifestHeaderServiceComponentAdded test on macOS and Windows

Fix manifestHeaderServiceComponentAdded test to read MANIFEST.MF directly

The test was using PluginRegistry.findModel() which returns a cached
in-memory model that may not reflect the updated MANIFEST.MF after the
DS annotation builder writes the Service-Component header. On macOS and
Windows, the model manager's resource change event processing can lag
behind the file changes, causing the test to read stale data.

Fix by reading the MANIFEST.MF file directly using java.util.jar.Manifest,
with refreshLocal() before reading, consistent with how other DS
annotation tests (AnnotationProcessorTest) read their test files.

Author: Copilot

ds/org.eclipse.pde.ds.annotations.tests/src/org/eclipse/pde/ds/internal/annotations/tests/ManagedProjectTest.java

@@ -1,21 +1,19 @@
 package org.eclipse.pde.ds.internal.annotations.tests;
 
-import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import java.io.InputStream;
 import java.util.Arrays;
 import java.util.List;
+import java.util.jar.Manifest;
 
 import org.eclipse.core.resources.ICommand;
+import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IMarker;
 import org.eclipse.core.resources.IResource;
-import org.eclipse.pde.core.plugin.IPluginModelBase;
-import org.eclipse.pde.core.plugin.PluginRegistry;
 import org.eclipse.pde.ds.internal.annotations.DSAnnotationCompilationParticipant;
-import org.eclipse.pde.internal.core.ibundle.IBundleModel;
-import org.eclipse.pde.internal.core.ibundle.IBundlePluginModelBase;
 import org.junit.jupiter.api.Test;
 
 @SuppressWarnings("restriction")
@@ -45,11 +43,14 @@ public void folderOSGIInfCreated() throws Exception {
 
 	@Test
 	public void manifestHeaderServiceComponentAdded() throws Exception {
-		IPluginModelBase pluginModel = PluginRegistry.findModel(testProject);
-		assertThat(pluginModel).isInstanceOf(IBundlePluginModelBase.class);
-		IBundleModel bundleModel = ((IBundlePluginModelBase) pluginModel).getBundleModel();
-		assertNotNull(bundleModel, "Missing bundle manifest!");
-		String serviceComponentHeader = bundleModel.getBundle().getHeader("Service-Component");
+		IFile manifestFile = testProject.getFile("META-INF/MANIFEST.MF");
+		manifestFile.refreshLocal(IResource.DEPTH_ZERO, null);
+		assertTrue(manifestFile.exists(), "Missing MANIFEST.MF!");
+		String serviceComponentHeader;
+		try (InputStream is = manifestFile.getContents(true)) {
+			Manifest manifest = new Manifest(is);
+			serviceComponentHeader = manifest.getMainAttributes().getValue("Service-Component");
+		}
 		assertNotNull(serviceComponentHeader, "Missing Service-Component header!");
 		String[] entries = serviceComponentHeader.split("\\s*,\\s*");
 		List<String> entryList = Arrays.asList(entries);