Adjust 2FA step 2 behaviour to move QR code into a modal #7016

Job	Run time
Javascript	3m 20s
Client	1m 20s
UI (0)	35m 20s
PHP (UnitTests, 7.2, Mysql, PDO_MYSQL)	2m 52s
UI (1)	17m 54s
UI (2)	17m 8s
UI (3)	14m 15s
PHP (UnitTests, 8.2, Mariadb, PDO_MYSQL)	2m 49s
PHP (UnitTests, 8.4, Mysql, MYSQLI)	2m 4s
PHP (SystemTestsPlugins, 7.2, Mysql, PDO_MYSQL)	12m 21s
PHP (SystemTestsPlugins, 8.2, Mariadb, PDO_MYSQL)	11m 49s
PHP (SystemTestsPlugins, 8.4, Mysql, MYSQLI)	16m 0s
PHP (SystemTestsCore, 7.2, Mysql, PDO_MYSQL)	9m 14s
PHP (SystemTestsCore, 8.2, Mariadb, PDO_MYSQL)	8m 55s
PHP (SystemTestsCore, 8.4, Mysql, MYSQLI)	10m 8s
PHP (IntegrationTestsCore, 7.2, Mysql, PDO_MYSQL)	12m 48s
PHP (IntegrationTestsCore, 8.2, Mariadb, PDO_MYSQL)	12m 0s
PHP (IntegrationTestsCore, 8.4, Mysql, MYSQLI)	15m 24s
PHP (IntegrationTestsPlugins, 7.2, Mysql, PDO_MYSQL)	29m 51s
PHP (IntegrationTestsPlugins, 8.2, Mariadb, PDO_MYSQL)	27m 42s
PHP (IntegrationTestsPlugins, 8.4, Mysql, MYSQLI)	36m 22s
	4h 59m 36s

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