chore(librarian): onboard to librarian (#336)

This PR onboards `google-cloud-core` to librarian.

Blocked on googleapis/python-cloud-core#330

Fixes googleapis/librarian#2453 🦕

---------

Co-authored-by: Anthonios Partheniou <[email protected]>

Author: ohmayr

packages/google-cloud-core/.github/.OwlBot.lock.yaml

@@ -0,0 +1,10 @@
+image: us-central1-docker.pkg.dev/cloud-sdk-librarian-prod/images-prod/python-librarian-generator@sha256:c8612d3fffb3f6a32353b2d1abd16b61e87811866f7ec9d65b59b02eb452a620
+libraries:
+  - id: google-cloud-core
+    version: 2.5.0
+    apis: []
+    source_roots:
+      - .
+    preserve_regex: []
+    remove_regex: []
+    tag_format: v{version}

packages/google-cloud-core/.github/.OwlBot.yaml

@@ -9,3 +9,10 @@ filterwarnings =
     # Remove once the minimum supported version of `google-api-core` is 2.15.0
     ignore:.*pkg_resources.declare_namespace:DeprecationWarning
     ignore:.*pkg_resources is deprecated as an API:DeprecationWarning
+    # Remove after support for Python 3.8 is dropped
+    ignore:You are using a non-supported Python version \(3\.8:DeprecationWarning
+    ignore:You are using a non-supported Python version \(3\.8:FutureWarning
+    # Remove after support for Python 3.9 is dropped
+    ignore:You are using a Python version \(3\.9:FutureWarning
+    # Remove after support for Python 3.10 is dropped
+    ignore:.*You are using a Python version \(3\.10:FutureWarning