check if validExistingUser when in pki AUTH_MODE #1579

Job	Run time
build-skills-service-for-ui-tests	2m 32s
ui-oauth-tests (1)	8m 37s
ui-oauth-tests (2)	7m 27s
ui-oauth-tests (3)	13m 2s
ui-oauth-tests (4)	8m 17s
ui-oauth-tests (5)	7m 7s
ui-oauth-tests (6)	8m 14s
ui-oauth-tests (7)	10m 6s
ui-oauth-tests (8)	7m 15s
ui-oauth-tests (9)	10m 20s
ui-oauth-tests (10)	10m 40s
ui-oauth-tests (11)	8m 10s
ui-oauth-tests (12)	10m 53s
ui-oauth-tests (13)	6m 22s
ui-oauth-tests (14)	7m 16s
ui-oauth-tests (15)	8m 53s
ui-oauth-tests (16)	9m 56s
ui-oauth-tests (17)	6m 45s
ui-oauth-tests (18)	10m 56s
ui-oauth-tests (19)	10m 6s
ui-oauth-tests (20)	18m 46s
	3h 11m 40s

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