reduce arduino coverage to avoid tests failing from external changes

[JacobBarthelmeh]

Example of failure that is being avoided by reducing the number of boards covered:

Compilation succeeded for wolfssl_AES_CTR on arduino:mbed_nano:nanorp2040connect
Block took 18 seconds
-------------------------------------------------------------------------------------
Checking wolfssl_client for arduino:mbed_nano:nanorp2040connect
arduino-cli compile --fqbn "arduino:mbed_nano:nanorp2040connect" "wolfssl_client"
WARNING: library WiFiNINA claims to run on samd, mbed_rp2040, megaavr architecture(s) and may be incompatible with your current board which runs on mbed_nano architecture(s).
/home/runner/Arduino/libraries/WiFiNINA/src/WiFiPreferences.cpp: In member function 'bool Preferences::begin(const char*, bool, const char*)':
/home/runner/Arduino/libraries/WiFiNINA/src/WiFiPreferences.cpp:30:21: error: 'prefBegin' is not a member of 'WiFiDrv'
     return WiFiDrv::prefBegin(name, readOnly, partition_label);
                     ^~~~~~~~~
/home/runner/Arduino/libraries/WiFiNINA/src/WiFiPreferences.cpp: In member function 'void Preferences::end()':
/home/runner/Arduino/libraries/WiFiNINA/src/WiFiPreferences.cpp:34:14: error: 'prefEnd' is not a member of 'WiFiDrv'
     WiFiDrv::prefEnd();
              ^~~~~~~
/home/runner/Arduino/libraries/WiFiNINA/src/WiFiPreferences.cpp: In member function 'bool Preferences::clear()':
/home/runner/Arduino/libraries/WiFiNINA/src/WiFiPreferences.cpp:43:21: error: 'prefClear' is not a member of 'WiFiDrv'
     return WiFiDrv::prefClear();
                     ^~~~~~~~~
/home/runner/Arduino/libraries/WiFiNINA/src/WiFiPreferences.cpp: In member function 'bool Preferences::remove(const char*)':
/home/runner/Arduino/libraries/WiFiNINA/src/WiFiPreferences.cpp:52:21: error: 'prefRemove' is not a member of 'WiFiDrv'
     return WiFiDrv::prefRemove(key);
                     ^~~~~~~~~~

[Copilot]

Pull request overview

This PR reduces the Arduino board coverage in CI to prevent test failures caused by external dependency issues, specifically removing boards that encountered compilation errors with the WiFiNINA library.

Changes:

• Removed two Arduino boards from the test matrix that were failing due to external WiFiNINA library compatibility issues

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[JacobBarthelmeh]

Retest this please Jenkins