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refactor: Remove usage of deprecated `get_username` injectable #8737

Job	Run time
Build and push backend image	1m 41s
Build and push frontend image	1m 47s
Build and push guacamole image	37s
Build and push session-preparation image	20s
Build and push docs image	40s
Install chart in kind cluster	1m 50s
	6m 55s

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