Fix runtimes when sending messages for ERT objectives #23158

Job	Run time
Lint with OpenDream	27s
Compile Maps	1m 26s
Find Maps to Test	11s
Windows Build	2m 51s
Run Linters	2m 35s
Unit Tests (corsat) / run_unit_tests	3m 3s
Unit Tests (bigredv2) / run_unit_tests	3m 54s
Unit Tests (chinook) / run_unit_tests	3m 31s
Unit Tests (almayer) / run_unit_tests	3m 35s
Unit Tests (desert_dam) / run_unit_tests	4m 56s
Unit Tests (fiorina_sciannex) / run_unit_tests	3m 11s
Unit Tests (ice_colony_v2) / run_unit_tests	4m 8s
Unit Tests (kutjevo) / run_unit_tests	3m 54s
Unit Tests (lv624) / run_unit_tests	3m 8s
Unit Tests (lv522_chances_claim) / run_unit_tests	3m 40s
Unit Tests (new_varadero) / run_unit_tests	3m 54s
Unit Tests (prison_station_fop) / run_unit_tests	3m 16s
Unit Tests (runtime) / run_unit_tests	3m 20s
Unit Tests (shivas_snowball) / run_unit_tests	4m 26s
Unit Tests (sorokyne_strata) / run_unit_tests	3m 11s
Alternate Tests (515, 1630, lv624) / run_unit_tests	3m 16s
Unit Tests (whiskey_outpost_v2) / run_unit_tests	3m 20s
Check Alternate Tests	3s
	1h 9m 16s

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