feat(examples): websocket autobahn test suit integration (IDF-14864)

[gabsuren]

Note

Adds an Autobahn WebSocket testsuite example (with Docker, scripts, and testee app) and CI to build/run on Linux and build target binaries, plus minor logging and linux compat updates.

• Examples / Autobahn testsuite:
  • Adds components/esp_websocket_client/examples/autobahn-testsuite with docker-compose.yml, configs (config/fuzzingserver*.json), automation scripts (run_tests.sh, scripts/*.py, quick/restore scripts), and a full testee project (CMake, Kconfig, app autobahn_testee.c, idf_component.yml, sdkconfigs for Linux/target).
• CI:
  • New workflows: autobahn__linux-test.yml runs fuzzing server, builds Linux testee, executes tests, generates/archives reports; autobahn__target-test.yml builds target binaries and uploads artifacts.
• esp_websocket_client:
  • Improves error logging by null-safe esp_err_to_name usage in write/read/connect/poll paths.
• Linux compatibility (esp_timer):
  • Adds REQUIRES esp_common in CMake and includes esp_err.h in esp_timer.h.

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