Fix to maintain order of package paths (#9887)

Author: akamat10

doc/whatsnew/fragments/9883.bugfix

@@ -0,0 +1,3 @@
+Fix to address indeterminacy of error message in case a module name is same as another in a separate namespace.
+
+Refs #9883

pylint/lint/pylinter.py

@@ -665,10 +665,12 @@ def check(self, files_or_modules: Sequence[str]) -> None:
                 )
 
         extra_packages_paths = list(
-            {
-                discover_package_path(file_or_module, self.config.source_roots)
-                for file_or_module in files_or_modules
-            }
+            dict.fromkeys(
+                [
+                    discover_package_path(file_or_module, self.config.source_roots)
+                    for file_or_module in files_or_modules
+                ]
+            ).keys()
         )
 
         # TODO: Move the parallel invocation into step 3 of the checking process