fix(cpn): prevent googletest installation #8243

Job	Run time
Run tests (x9dp2019)	4m 19s
Run tests (tx16s)	7m 54s
Run tests (nv14)	6m 52s
Run tests (el18)	7m 59s
Run tests (t12)	3m 44s
Run tests (t16)	8m 52s
Run tests (t18)	8m 21s
Run tests (t8)	3m 12s
Run tests (tlite)	3m 27s
Run tests (t20)	3m 25s
Run tests (tx12)	3m 14s
Run tests (x10)	7m 2s
Run tests (x12s)	7m 13s
Run tests (x7)	3m 18s
Run tests (x9d)	3m 16s
Run tests (x9dp)	3m 6s
Run tests (x9e)	3m 58s
Run tests (x9lite)	3m 57s
Run tests (x9lites)	3m 13s
Run tests (xlite)	3m 21s
Run tests (xlites)	3m 16s
Run builds (nv14;el18)	7m 13s
Run builds (t12)	2m 7s
Run builds (t16)	4m 57s
Run builds (t18)	4m 23s
Run builds (t8;zorro;pocket;commando8)	5m 2s
Run builds (tlite;tpro;tprov2;lr3pro)	5m 0s
Run builds (t20)	2m 41s
Run builds (tx12;tx12mk2;boxer)	4m 54s
Run builds (tx16s)	4m 8s
Run builds (x10;x10-access)	8m 48s
Run builds (x12s)	5m 7s
Run builds (x7;x7-access)	3m 40s
Run builds (x9d;x9dp;x9dp2019)	4m 16s
Run builds (x9e;x9e-hall)	3m 46s
Run builds (x9lite;x9lites)	3m 13s
Run builds (xlite;xlites)	3m 0s
	2h 55m 14s

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