ci: use draft releases to support immutable GitHub releases #2077

Job	Run time
contract-tests-curl	4m 51s
build-test-server-mac	4m 35s
contract-tests-fdv2	5m 15s
build-test-server-mac-curl	4m 36s
build-test-server	9m 29s
contract-tests-fdv2-curl	5m 29s
contract-tests	4m 46s
build-test-server-curl	9m 2s
build-test-server-windows	20m 9s
build-test-server-windows-curl	21m 20s
	1h 29m 32s

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