fix(ci): remove macOS test binaries from git, update .gitignore

The gap3, agc, and gps test binaries (Mach-O executables compiled on macOS)
were accidentally tracked. CI runs on Linux and fails with 'Exec format error'.
Removed from index and added to .gitignore.

9_Firmware/9_1_Microcontroller/tests/.gitignore

@@ -18,3 +18,11 @@ test_bug12_pa_cal_loop_inverted
 test_bug13_dac2_adc_buffer_mismatch
 test_bug14_diag_section_args
 test_bug15_htim3_dangling_extern
+test_agc_outer_loop
+test_gap3_emergency_state_ordering
+test_gap3_emergency_stop_rails
+test_gap3_idq_periodic_reread
+test_gap3_iwdg_config
+test_gap3_overtemp_emergency_stop
+test_gap3_temperature_max
+test_um982_gps