chore: enhance manifest processing (#8283)

`custom-manifest.json` did not include private classes, which caused
issues when scripts attempted to resolve the hierarchy because some
classes were missing.

Starting with the next release, `custom-manifest.json` will include
private declarations (only custom elements). Therefore, this PR filters
them out during wrapper generation. All private properties, slots, and
other members for these declarations will still be filtered out.

Author: nnaydenow

packages/cli/src/scripts/create-wrappers/main.ts

@@ -47,6 +47,11 @@ export default async function createWrappers(packageName: string, outDir: string
       continue;
     }
 
+    // Skip non-public declarations
+    if (declaration._ui5privacy && declaration._ui5privacy !== 'public') {
+      continue;
+    }
+
     const wrapper = new WebComponentWrapper(declaration.tagName, declaration.name, webComponentImport, packageName);
     const attributes = declaration.members?.filter(filterAttributes) ?? [];