BUILD: Exclude kafka-mesh/*.yaml from main configs filegroup (#1028)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: phlax <454682+phlax@users.noreply.github.com>

Author: Copilot

BUILD

@@ -66,6 +66,7 @@ filegroup(
             "mysql/*",
             "postgres/*",
             "kafka/*.yaml",
+            "kafka-mesh/*.yaml",
         ],
     ) + ["@envoy-example-wasmcc//:configs"],
     visibility = ["//visibility:public"],