feat(liveness): Update Liveness UI

[tylerjroach]

• PR conforms to Pull Request guidelines.

Issue #, if available:

Description of changes:

• Update the start screen to latest designs from Liveness team
• Fix: If the liveness view is removed (ex: back pressed), and a new session is started, the previous websocket would cause the camera to close if the server closed the socket while the second session was in progress.
• Fix: The liveness match timeout timer was not getting canceled if the detector was stopped. This could have caused the camera to close on a new session once the timer completed.

How did you test these changes?
(Please add a line here how the changes were tested)

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests
• Added Integration Tests
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[tjleing]

Looks good, one nit! Will note that I'm able to block the freshness check from proceeding by moving my face away from the camera during the 1000ms wait time we introduced. Haven't done a super deep dive but I think onFrameFaceUpdate isn't actually being called if there's no visible face, which makes sense to me.