Rework xeno guaranteed slots logic and Fix thunderdome evolution slot bug #16497

Job	Run time
Compile Maps	1m 25s
Find Maps to Test	10s
Run Linters	1m 59s
Windows Build	2m 35s
Unit Tests (bigredv2) / run_unit_tests	6m 11s
Unit Tests (corsat) / run_unit_tests	6m 17s
Unit Tests (fiorina_sciannex) / run_unit_tests	6m 6s
Unit Tests (desert_dam) / run_unit_tests	6m 14s
Unit Tests (ice_colony_v2) / run_unit_tests	6m 19s
Unit Tests (kutjevo) / run_unit_tests	6m 13s
Unit Tests (almayer) / run_unit_tests	6m 46s
Unit Tests (chinook) / run_unit_tests	6m 16s
Unit Tests (lv522_chances_claim) / run_unit_tests	6m 13s
Unit Tests (lv624) / run_unit_tests	6m 20s
Unit Tests (prison_station_fop) / run_unit_tests	6m 15s
Unit Tests (runtime) / run_unit_tests	5m 57s
Unit Tests (new_varadero) / run_unit_tests	6m 36s
Unit Tests (shivas_snowball) / run_unit_tests	6m 29s
Unit Tests (sorokyne_strata) / run_unit_tests	6m 56s
Unit Tests (whiskey_outpost_v2) / run_unit_tests	6m 2s
Alternate Tests (515, 1610, lv624) / run_unit_tests	6m 1s
Check Alternate Tests	4s
	1h 53m 24s

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