NEW FEATURE | client side routing in embedded applications

[scottqueen-bixal]

Implementing a client side browser will come with allow us to access more advanced dynamics in location and state organized views, like;

• NEW FEATURE | Return to first step of form, without clearing the form NEW FEATURE | Return to first step of form, without clearing the form #1473
• allow users to navigate history through the native browser button
• remove the need for "back" links in the ui
• etc.

Acceptance Criteria

• virtual routes include, /<form-step-heading, /verify-selections, /results, /results/not-eligible
• handles shared token and its associated selection params
• when integrated, nginx will handle redirects for unkown child paths to life events, /<life-event/**/*, ie. /death/unknown-path
• current functionality is expected to work in the same or improved manner

[scottqueen-bixal]

@XavierMetichecchia going to set up a test on dev for routing https://github.com/orgs/GSA/projects/48/views/16?pane=issue&itemId=81367578

[fongcindy]

I QA'ed #1473 , nav history through browser back, removal of "back" link, they are all working properly on my end. LGTM

[nickpistone]

Tested the regular flow and tracking looks normal as expected.