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

Author: gcf-owl-bot[bot]

.flake8

@@ -21,6 +21,9 @@ exclude =
   # Exclude environment test code.
   tests/environment/**
 
+  # Exclude environment test code.
+  tests/environment/**
+
   # Exclude generated code.
   **/proto/**
   **/gapic/**

.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