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refactor: Remove usage of deprecated `get_username` injectable #8730

Job	Run time
Build and push backend image	1m 37s
Build and push frontend image	1m 59s
Build and push guacamole image	36s
Build and push session-preparation image	27s
Build and push docs image	30s
Install chart in kind cluster	1m 51s
	7m 0s

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