samples: net: wpan_serial: Excluding nucleo_wba65ri platform

As CONFIG_BUILD_ONLY_NO_BLOBS feature is not implemented for
stm32wbax socs, we have temporarily excluded
nucleo_wba65ri platform from CI build tests.

Issue https://github.com/zephyrproject-rtos/zephyr/issues/95495
will be updated accordingly

Signed-off-by: Alessandro Manganaro <alessandro.manganaro@st.com>
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