chore(python): remove .flake8 configuration file in templates (#983)

* chore(python): remove .flake8 configuration file in templates

Source-Link: googleapis/synthtool@fe66b0b
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:ecf409a43d8b157fb83c403de4d83e3da7d88e423044410c0e2434bf776221d1

* 🦉 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

* 🦉 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

* 🦉 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: sha256:5581906b957284864632cde4e9c51d1cc66b0094990b27e689132fe5cd036046
-# created: 2025-03-05
+  digest: sha256:ecf409a43d8b157fb83c403de4d83e3da7d88e423044410c0e2434bf776221d1
+# created: 2025-04-10T16:21:41.67162455Z

owlbot.py

@@ -126,13 +126,6 @@ def place_before(path, text, *before_text, escape=None):
     'pass_down_envvars+=(\n    "ENVIRONMENT"\n    "RUNTIME"',
 )
 
-# don't lint environment tests
-s.replace(
-    ".flake8",
-    "exclude =",
-    "exclude =\n  # Exclude environment test code.\n  tests/environment/**\n",
-)
-
 # use conventional commits for renovate bot
 s.replace(
     "renovate.json",