Make actions column in Databases table sticky

[artemmufazalov]

Probably actions column should stick to the right side of screen on scroll

From #2305 (comment)

[artemmufazalov]

For now if table is wide enough, column with actions is out of view. Column with actions should always be visible.
For now it's only presented in Tenants page (getDBActionsColumn). But I think it should be kinda general solution.

#2337