Instead of assuming the initial info dialog open should auto
close, explicitly call opening of the dialog with a flag for
auto closing. This better facilitates the auto close timeout
being set at any time.

The changes led to refactoring out state in the InfoDialogButton
in preference for always clearing the timeout instead of
first checking for interaction before clearing.

Delay showing the dialog until after joining the conference
instead of as soon as possible. This resolves a few issues.
One is the dialog displaying right before the permissions
overlay is shown. Another is that logically it does not
make sense to show the invite options when unable to invite.
It also sidesteps the initial react UI bootstrapping that
can cause race conditions with toolbar re-renders causing
misalignment. Lastly, it prepares prematurely for what I
assume will be changes for when the info dialog will
actually be shown automatically.