Improvements on NuttX app. Add tests for multiple use cases. (RDT-1038)

[fdcavalcanti]

Description

This PR moves the _get_binary_target_info method to the NuttxSerial(EspSerial) class, since it is only used on Espressif Devices.
Also:

• Remove the 'target' option from the app class (it is not required since we can use the target fixture).
• Add some test cases.

Related

Testing

Added tests for general use and also QEMU.

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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.

[hfudev]

the test cases are failing and I'm afraid it's not a false alarm this time. could you help take a look?

[fdcavalcanti]

Does the CI support testing on ESP32S3?

[hfudev]

Does the CI support testing on ESP32S3?

no for ARM runners. the ARM runners only have esp32, esp32s2, and esp32c3 connected.

could you make the tests run with one of these targets? s2 shall also work?

[fdcavalcanti]

Ok, I did not know that.
I'll just switch to ESP32, no problem.

[hfudev]

Thanks for the PR. Merging it.