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refactor: Remove usage of deprecated `get_username` injectable #8735

Job	Run time
Build and push backend image	1m 37s
Build and push frontend image	1m 50s
Build and push guacamole image	31s
Build and push session-preparation image	19s
Build and push docs image	32s
Install chart in kind cluster	2m 22s
	7m 11s

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