ci: use draft releases to support immutable GitHub releases #3063

Job	Run time
build-test	6m 31s
build-test-client-windows-curl	14m 42s
build-test-client-windows	13m 51s
build-test-client-mac-curl	2m 57s
build-test-curl	6m 19s
build-test-client-mac	4m 59s
contract-tests	3m 27s
contract-tests-curl	3m 16s
	56m 2s

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