[NEXUS-6820] Add option to not automatically hide tab header when there is only one tab

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
[NEXUS-6820] Always show repository tabs header

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Always show repository item info tabs header

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>