[mavlink] Updated mavlink module with minor improvements

scripts/udp_gs_tester.py

src/shared/Components/FilterSelector/FilterSelector.cpp

src/shared/Modules/Mavlink/BaseMavlinkModule.cpp

src/shared/Modules/Mavlink/BaseMavlinkModule.h

src/shared/Modules/Mavlink/MavlinkCodec.cpp

src/shared/Modules/SkywardHubStrings.h