BIGTOP-4376: Add ut cases for command stage classes in server module #787

Job	Run time
Build project (17)	2m 9s
Build project (21)	1m 51s
Check typos	6s
Check code style	16s
Check license	31s
Run unit test(Java)	1m 18s
Run unit tests(Vue/Typescript)	1m 7s
	7m 18s

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