Add 15 minute session timeout

[schmelz21]

💡 Summary

Prompt the user to stay signed in after 14 and logout after 15 minutes of inactivity.

Motivation and context

As per our security concerns we want web sessions to be set to 15 minutes. After 15 minutes the user will be logged out and sent back to the login screen. A Modal seen in the screen shots shows after 14 minutes and gives a 1 minute countdown.

This issue has been created new, as past efforts were not properly deployed. https://github.com/cisagov/crossfeed/pull/2060 https://github.com/cisagov/crossfeed/pull/2164

Implementation notes

• Program session timeout
• Add graphical component to warn User session will close on 15 mins

Acceptance criteria

• [ ] Issue linked to Pull Request
• [ ] New UI updates have been screenshot
• [ ] Automated test added
• [ ] User testing completed

[schmelz21]

@cduhn17 , @Matthew-Grayson , @aloftus23 - Closing issue as this team confirmed that the functionality is working in DMZ as references to the work is noted in this issue. No code updates were necessary only the completion of user tests.