Move configurable EtherCAT timeouts to RTUnit

This implies reverting these changes partially: https://git.h2t.iar.kit.edu/sw/armarx-integration/robots/armar7/rt/-/commit/5e7bce787fba0eca9663afebaec931229b7643d2 (all except for changes in scenarios/armar7_l1_1_unit/config/armar7_unit.cfg)