feat(ci): Build network examples form esp-idf

[peter-marcisovsky]

Description

Build esp-idf network examples using usb device component

examples/network/sta2eth correctly built

2026-04-15T09:12:48.2445150Z (cmake) App examples/network/sta2eth, target esp32s2, sdkconfig (default), build in examples/network/sta2eth/build_esp32s2_default
2026-04-15T09:12:48.2446539Z (cmake) App examples/network/sta2eth, target esp32s3, sdkconfig (default), build in examples/network/sta2eth/build_esp32s3_default

Related

• Same approach as implemented in feat(ci): Fix CI build and Run tinyusb#79

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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

Low Risk
Changes are limited to CI configuration/workflow wiring; main risk is inadvertently breaking the build matrix or artifact paths for existing USB example jobs.

Overview
Extends the IDF examples CI to include building the networking example examples/network/sta2eth (in addition to existing USB host/device examples) and disables it when USB OTG or Wi‑Fi are unavailable.

Updates build_and_run_idf_examples.yml to manage separate USB_EXAMPLES_PATH and NETWORK_EXAMPLES_PATH, apply the esp_tinyusb override to sta2eth, and adjust artifact upload/run steps to continue operating only on USB example outputs.

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