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refactor: Remove usage of deprecated `get_username` injectable #8734

Job	Run time
Build and push backend image	1m 38s
Build and push frontend image	1m 56s
Build and push guacamole image	26s
Build and push session-preparation image	21s
Build and push docs image	31s
Install chart in kind cluster	1m 55s
	6m 47s

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