Make CODECOV_TOKEN optional #1214

Job	Run time
pre	3s
continuous-integration / build-linux (Release, ubuntu-latest)	2m 2s
continuous-integration / build-windows (Release, windows-2019)	24m 35s
continuous-integration / build-windows (Release, windows-latest)	20m 22s
continuous-integration / build-macos	11m 49s
continuous-integration / build-linux (Debug, ubuntu-22.04)	5m 23s
continuous-integration / build-linux (Debug, ubuntu-latest)	2m 53s
continuous-integration / build-linux (Release, ubuntu-22.04)	2m 11s
continuous-integration / test-linux (Release, ubuntu-latest, true)	3m 54s
continuous-integration / test-linux (Debug, ubuntu-latest, true)	4m 10s
continuous-integration / test-linux (Release, ubuntu-22.04, true)	3m 53s
continuous-integration / test-linux (Debug, ubuntu-22.04, false, ON)	8m 20s
continuous-integration / test-macos	0s
continuous-integration / test-windows (Release, windows-latest)	3m 11s
continuous-integration / test-windows (Release, windows-2019)	3m 25s
continuous-integration / draft-release	0s
	1h 36m 11s

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