testsuite: use silent_optimizer option to not clutter meson log-file

tests/TeX/fs2000_corr_ME.mod

tests/analytic_derivatives/fs2000_analytic_derivation.mod

tests/arima/mod1a.mod

tests/arima/mod1b.mod

tests/arima/mod1c.mod

tests/arima/mod2a.mod

tests/arima/mod2b.mod

tests/arima/mod2c.mod

tests/bgp/solow-1/solow.mod

tests/conditional_forecasts/2/fs2000_est.mod

tests/data/mod1a.mod

tests/dates/dseries_interact.mod

tests/dates/fs2000.mod

tests/discretionary_policy/dennis_1_estim.mod

tests/dsge-var/dsgevar_forward_calibrated_lambda.mod

tests/dsge-var/dsgevar_forward_estimated_lambda.mod

tests/estimation/MH_recover/fs2000_recover.mod

tests/estimation/MH_recover/fs2000_recover_2.mod

tests/estimation/MH_recover/fs2000_recover_3.mod

tests/estimation/MH_recover/fs2000_recover_tarb.mod