bin/gen_release_notes: Don't consider issues for other projects

We have enough commits in mesa that have external dependencies that we
need to be sure that a Closes: https://... is actually for mesa and not
for another project.

Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12201>

bin/gen_release_notes_test.py

@@ -77,6 +77,8 @@ async def test_gather_commits():
     [
         # It is important to have the title on a new line, as
         # textwrap.dedent wont work otherwise.
+
+        # Test the `Closes: #N` syntax
         (
             '''\
             A commit
@@ -87,6 +89,8 @@ async def test_gather_commits():
             ''',
             ['1'],
         ),
+
+        # Test the Full url
         (
             '''\
             A commit with no body
@@ -95,6 +99,24 @@ async def test_gather_commits():
             ''',
             ['3456'],
         ),
+
+        # Test projects that are not mesa
+        (
+            '''\
+            A commit for libdrm
+
+            Closes: https://gitlab.freedesktop.org/mesa/drm/-/3456
+            ''',
+            [],
+        ),
+        (
+            '''\
+            A commit for for something else completely
+
+            Closes: https://github.com/Organiztion/project/1234
+            ''',
+            [],
+        ),
     ])
 async def test_parse_issues(content: str, bugs: typing.List[str]) -> None:
     mock_com = mock.AsyncMock(return_value=(textwrap.dedent(content).encode(), ''))