#2490 Add a test for theme preference #1573

Job	Run time
build-skills-service-for-ui-tests	2m 37s
ui-oauth-tests (1)	8m 26s
ui-oauth-tests (2)	7m 58s
ui-oauth-tests (3)	10m 24s
ui-oauth-tests (4)	8m 42s
ui-oauth-tests (5)	6m 47s
ui-oauth-tests (6)	9m 5s
ui-oauth-tests (7)	9m 12s
ui-oauth-tests (8)	6m 45s
ui-oauth-tests (9)	11m 31s
ui-oauth-tests (10)	10m 6s
ui-oauth-tests (11)	8m 30s
ui-oauth-tests (12)	9m 31s
ui-oauth-tests (13)	6m 7s
ui-oauth-tests (14)	7m 4s
ui-oauth-tests (15)	8m 36s
ui-oauth-tests (16)	9m 39s
ui-oauth-tests (17)	6m 28s
ui-oauth-tests (18)	10m 38s
ui-oauth-tests (19)	9m 46s
ui-oauth-tests (20)	18m 51s
	3h 6m 43s

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