Fix Kafka integration tests to support both WORKSPACE and bzlmod modes

Updated kafka_broker_integration_test.py and kafka_mesh_integration_test.py to
detect kafka_bin_dir in both modes instead of hardcoding bzlmod path.

Implementation:
- Try bzlmod path first: external/_main~envoy_dependencies_extension~kafka_server_binary/bin
- Fall back to WORKSPACE path: external/kafka_server_binary/bin
- Use os.path.isdir() to check which path exists

This fixes Kafka test timeouts in WORKSPACE mode while preserving bzlmod
compatibility.

Co-authored-by: phlax <454682+phlax@users.noreply.github.com>

Author: Copilot

configs/configgen.sh

@@ -30,7 +30,7 @@ for FILE in "$@"; do
     ;;
   *)
 
-    FILENAME="$(echo "$FILE" | sed -e 's/.*examples[^/]*\///g')"
+    FILENAME="$(echo "$FILE" | sed -e 's/.*example[^/]*\///g')"
     # Configuration filenames may conflict. To avoid this we use the full path.
     cp "$FILE" "$OUT_DIR/${FILENAME//\//_}"
     ;;

contrib/kafka/filters/network/test/broker/integration_test/kafka_broker_integration_test.py

@@ -313,8 +313,11 @@ def start(self):
         os.mkdir(kafka_store_dir)
 
         # Find the Kafka server 'bin' directory.
+        # Try bzlmod path first, fall back to WORKSPACE path
         kafka_bin_dir = os.path.join(
             '.', 'external', '_main~envoy_dependencies_extension~kafka_server_binary', 'bin')
+        if not os.path.isdir(kafka_bin_dir):
+            kafka_bin_dir = os.path.join('.', 'external', 'kafka_server_binary', 'bin')
 
         # Main initialization block:
         # - generate random ports,

contrib/kafka/filters/network/test/mesh/integration_test/kafka_mesh_integration_test.py

@@ -392,8 +392,11 @@ def start(self):
         os.mkdir(kafka_store_dir2)
 
         # Find the Kafka server 'bin' directory.
+        # Try bzlmod path first, fall back to WORKSPACE path
         kafka_bin_dir = os.path.join(
             '.', 'external', '_main~envoy_dependencies_extension~kafka_server_binary', 'bin')
+        if not os.path.isdir(kafka_bin_dir):
+            kafka_bin_dir = os.path.join('.', 'external', 'kafka_server_binary', 'bin')
 
         # Main initialization block:
         # - generate random ports,