chore(python): remove CONTRIBUTING.rst from templates (#1038)

* chore(python): remove CONTRIBUTING.rst from templates

Source-Link: googleapis/synthtool@c96fb11
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:710b70faff81151657d89db6e028c23a1051787598c8276bdd8eef25c92da8ab

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* Remove replacement in owlbot.py

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Anthonios Partheniou <partheniou@google.com>

Author: gcf-owl-bot[bot]

.github/.OwlBot.lock.yaml

@@ -13,5 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
-  digest: sha256:a7aef70df5f13313ddc027409fc8f3151422ec2a57ac8730fce8fa75c060d5bb
-# created: 2025-04-10T17:00:10.042601326Z
+  digest: sha256:710b70faff81151657d89db6e028c23a1051787598c8276bdd8eef25c92da8ab
+# created: 2025-04-10T17:48:54.829145676Z

owlbot.py

@@ -290,23 +290,4 @@ def lint_setup_py(session):
 # Setup service account credentials.""",
 )
 
-
-# Add a section on updating conformance tests to contributing.
-s.replace(
-    "CONTRIBUTING.rst",
-    "\nTest Coverage",
-    """*************
-Updating Conformance Tests
-**************************
-
-The firestore client libraries use a shared set of conformance tests, the source of which can be found at https://github.com/googleapis/conformance-tests.
-
-To update the copy of these conformance tests used by this repository, run the provided Makefile:
-
-   $ make -f Makefile_v1
-
-*************
-Test Coverage"""
-)
-
 s.replace("noxfile.py", "\"pytest-asyncio\"", "\"pytest-asyncio==0.21.2\"")