Cleanup runechat callbacks upon deletion #8219

Job	Run time
Run Linters	2m 35s
Lint with OpenDream	34s
Collect data for other tasks	59s
Windows Build	2m 3s
Compile Maps	2m 2s
Integration Tests (boxstation) / run_integration_tests	13m 21s
Integration Tests (deltastation) / run_integration_tests	13m 10s
Integration Tests (icebox) / run_integration_tests	12m 10s
Integration Tests (kilostation) / run_integration_tests	17m 4s
Integration Tests (multiz_debug) / run_integration_tests	12m 47s
Integration Tests (metastation) / run_integration_tests	13m 15s
Integration Tests (northstar) / run_integration_tests	14m 21s
Integration Tests (runtimestation) / run_integration_tests	10m 35s
Integration Tests (tramstation) / run_integration_tests	13m 17s
Alternate Tests (515, 1627, runtimestation) / run_integration_tests	10m 48s
Check Alternate Tests	1s
Compare Screenshot Tests	2m 56s
	2h 21m 58s

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