mergify: also remove needs: work if CI ready
mergify: also remove needs: work if CI ready

There are two cases here: either PR was in  review or needs work. in any case, new
CI should be started as pr-head is yellow. Once it completes, based on reviews, we can move
to ready for merge or back to needs work if fails.

andcor02/mbed-os,mbedmicro/mbed,andcor02/mbed-os,andcor02/mbed-os,kjbracey-arm/mbed,mbedmicro/mbed,mbedmicro/mbed,kjbracey-arm/mbed,mbedmicro/mbed,andcor02/mbed-os,kjbracey-arm/mbed,kjbracey-arm/mbed,andcor02/mbed-os,andcor02/mbed-os,mbedmicro/mbed