[FLINK-37035][release] Add new version 2.1 and update GHA nightly bui… #188

Job	Run time
Pre-compile Checks / Basic QA	9m 37s
Default (Java 17) / Compile	30m 3s
Default (Java 17) / Test packaging/licensing	32m 46s
Default (Java 17) / E2E (group 1)	1h 42m 19s
Default (Java 17) / Test (module: core)	29m 19s
Default (Java 17) / E2E (group 2)	2h 4m 26s
Default (Java 17) / Test (module: python)	27m 33s
Default (Java 17) / Test (module: table)	32m 21s
Default (Java 17) / Test (module: connect)	13m 0s
Default (Java 17) / Test (module: tests)	33m 34s
Default (Java 17) / Test (module: misc)	23m 53s
	7h 38m 51s

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