[VnV] Decrease or delete hard coded walltimes after activation of enable turbo

examples/gaia/bosse-t3d/vnv_bosse-t3d.py

examples/gaia/bump-t2d/vnv_bump2d.py

examples/gaia/flume_bc-t2d/vnv_flume_bc.py

examples/telemac2d/canalalgae/vnv_canalalgae.py

examples/telemac2d/malpasset/vnv_malpasset_fv.py

examples/telemac2d/riv_art/vnv_riv_art.py

examples/telemac3d/NonLinearWave/vnv_non_linear_wave.py

examples/tomawac/Rip/vnv_rip.py

examples/tomawac/fetch_limited/vnv_fetch_lim.py