fix(ilc): hard remove CSS link when an embedded application is unmounted #2184

Job	Run time
Run E2E tests (mysql, mysql, 3306)	4m 47s
Build ILC (src, refs/pull/611/merge)	6m 13s
Run E2E tests (pg, postgres, 5432)	4m 27s
Build Registry (src, refs/pull/611/merge)	10m 2s
Build ILC (dest, master)	1m 27s
Build Registry (dest, master)	53s
Test Registry (src, refs/pull/611/merge, sqlite3)	1m 27s
Test Registry (src, refs/pull/611/merge, mysql, mysql, 3306)	1m 27s
Test Registry (src, refs/pull/611/merge, pg, postgres, 5432)	1m 24s
Test Registry (dest, master, sqlite3)	1m 25s
Test Registry (dest, master, mysql, mysql, 3306)	1m 29s
Test Registry (dest, master, pg, postgres, 5432)	1m 25s
PR Coverage Report	42s
Push images to registry	6s
Build documentation	0s
	37m 14s

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