fix(websocket): Update Remaining Websocket Echo Server

[glmfe]

Description

Update Websocket Echo Server, "wss://echo.websocket.events" is no longer available.

Related

Testing

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Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.

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Note

Switch examples to WSS and add TLS configuration and certificate handling for the Linux websocket client.

• Examples (Linux/Target):
  • Switch default endpoint from ws://echo.websocket.events to wss://echo.websocket.org in README.md, example logs, and sdkconfig.*.
• Config (Kconfig):
  • Add TLS options: WS_OVER_TLS_SERVER_AUTH (default on), WS_OVER_TLS_MUTUAL_AUTH, and WS_OVER_TLS_SKIP_COMMON_NAME_CHECK.
  • Update WEBSOCKET_URI default to WSS.
• Code (websocket_linux.c):
  • Integrate TLS support: include esp_crt_bundle.h, set crt_bundle_attach for server auth, support mutual auth via client cert/key, and optional CN check skip.
  • Minor log/event sequence reflected in example output (e.g., WEBSOCKET_EVENT_BEGIN).

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