ci: use draft releases to support immutable GitHub releases #2075

Job	Run time
build-test-server	9m 23s
build-test-server-mac	6m 43s
contract-tests-curl	4m 57s
build-test-server-mac-curl	7m 41s
build-test-server-windows-curl	24m 56s
build-test-server-windows	19m 35s
contract-tests-fdv2	5m 25s
build-test-server-curl	9m 25s
contract-tests-fdv2-curl	5m 30s
contract-tests	5m 11s
	1h 38m 46s

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