docs: release notes for the v20.0.0-rc.1 release #1115

Job	Run time
list	31s
workflow (build-cli)	1m 25s
workflow (modules-builder-tests)	1m 42s
workflow (devkit-core-tests)	1m 16s
workflow (devkit-core-tests-rerun)	1m 29s
workflow (build-unit-tests)	2m 30s
	8m 53s

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