fix(ilc/server): don't block the cache if promise never resolves #2085

Job	Run time
Build Registry (src, refs/pull/590/merge)	17s
Build Registry (dest, master)	20s
Build ILC (src, refs/pull/590/merge)	6m 59s
Run E2E tests (mysql, mysql, 3306)	4m 13s
Build ILC (dest, master)	7m 16s
Run E2E tests (pg, postgres, 5432)	4m 11s
Test Registry (src, refs/pull/590/merge, sqlite3)	2m 18s
Test Registry (src, refs/pull/590/merge, mysql, mysql, 3306)	2m 10s
Test Registry (src, refs/pull/590/merge, pg, postgres, 5432)	1m 40s
Test Registry (dest, master, sqlite3)	1m 33s
Test Registry (dest, master, mysql, mysql, 3306)	1m 33s
Test Registry (dest, master, pg, postgres, 5432)	1m 36s
PR Coverage Report	6m 5s
Push images to registry	14s
Build documentation	0s
	40m 25s

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