Origin/morwenna/hackweek branch

[MorwennaG]

UX: Enter key shortcut after entering IP address is resolved by adding On Submit to IPJoiningUI and IPHostingUI.

Ticket link: https://jira.unity3d.com/browse/MTT-3784.

Issue Number(s)

MTT-3784

Contribution checklist

• [ ] Tests have been added for boss room and/or utilities pack
• [ ] Release notes have been added to the project changelog file and/or package changelog file
• [x] Pull request has a meaningful description of its purpose
• [x] All commits are accompanied by meaningful commit messages
• [x] JIRA ticket ID is in the PR title or at least one commit message
• [x] Include the ticket ID number within the body message of the PR to create a hyperlink

[SamuelBellomo]

Congratz on the first PR! This should merge to develop, not main. Also make sure to check mark the list in the description.