UI: make a newly added Network the default one (apache#9708) (apache#10022)

* UI: Checkbox to make a newly added Network the default one in the Instance's Network tab

* Fixed an issue that was causing exit from network tab after add-network

Co-authored-by: Abhisar Sinha <63767682+abh1sar@users.noreply.github.com>

Author: 2 people