chore(python): remove unused docs scripts

Source-Link: googleapis/synthtool@450363b
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:5581906b957284864632cde4e9c51d1cc66b0094990b27e689132fe5cd036046

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:f016446d6e520e5fb552c45b110cba3f217bffdd3d06bdddd076e9e6d13266cf
-# created: 2025-02-21T19:32:52.01306189Z
+  digest: sha256:5581906b957284864632cde4e9c51d1cc66b0094990b27e689132fe5cd036046
+# created: 2025-03-04T21:27:45.405098857Z

.kokoro/docs/common.cfg

@@ -84,3 +84,23 @@ env_vars: {
 
 ###################################################
 
+
+
+#############################################
+# this section merged from .kokoro/common_env_vars.cfg using owlbot.py
+
+env_vars: {
+    key: "PRODUCT_AREA_LABEL"
+    value: "observability"
+}
+env_vars: {
+    key: "PRODUCT_LABEL"
+    value: "error-reporting"
+}
+env_vars: {
+    key: "LANGUAGE_LABEL"
+    value: "python"
+}
+
+###################################################
+