[FLINK-37671] Fix ChangelogMode#toString (#26452) #1903

Job	Run time
Pre-compile Checks / Basic QA	9m 12s
Default (Java 17) / Compile	9m 20s
Default (Java 17) / Test packaging/licensing	33m 48s
Default (Java 17) / E2E (group 1)	1h 42m 44s
Default (Java 17) / Test (module: core)	32m 23s
Default (Java 17) / E2E (group 2)	1h 24m 56s
Default (Java 17) / Test (module: python)	29m 56s
Default (Java 17) / Test (module: table)	37m 29s
Default (Java 17) / Test (module: connect)	21m 15s
Default (Java 17) / Test (module: tests)	32m 3s
Default (Java 17) / Test (module: misc)	23m 34s
	6h 56m 40s

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