`Communication`: Fix the member search of course-wide channels #6152

Job	Run time
Detect Changed Areas	15s
Quality / Client Code Style	6m 16s
Quality / Query Quality Check	11s
Quality / Server Code Style	4m 20s
CodeQL / Analyse (Java + JS/TS)	11m 59s
Quality / Server Code Quality	9m 9s
Bean Instantiations / Bean Instantiation Check	3m 13s
Build / Build .war artifact	4m 23s
Quality / Client Compilation	1m 10s
Test / Client Tests	34m 11s
Test / Server Tests (PostgreSQL)	30m 34s
Validate Gradle Wrapper	-1s
Lint Workflows	-1s
Build Documentation	-1s
Version Consistency	-1s
Check Translation Keys	-1s
Deploy Documentation	-1s
Build / Build and Push Docker Image	-1s
Build / Sign and Attest Docker Image	-1s
Build / Save Docker Image Tag	-1s
Build / Build and Push Docker Image (PR, amd64)	35m 0s
Build / Upload Release Artifact	0s
Report PR Coverage	17s
CI Summary	5s
All required CI Passed	4s
E2E	-1s
	2h 20m 57s

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