Set lastRefresh on initial form load

[hursey013]

Fixes #895

The form looks for route changes to update the lastRefresh value (by way of onRouteChanged() > refreshToken() > updateApplication(): https://github.com/18F/e-QIP-prototype/blob/develop/src/views/Form/Form.jsx#L116-L127) however on initial load of the app this normal handling is skipped and instead simply redirects users to the intro page: https://github.com/18F/e-QIP-prototype/blob/develop/src/views/Form/Form.jsx#L51, never setting a value for lastRefresh. This uses React's componentDidMount() to run the refreshToken() method on initial render, setting an initial value for lastRefresh.

[codecov]

Codecov Report

Merging #906 into develop will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           develop     #906     +/-   ##
==========================================
- Coverage    46.75%   46.66%   -0.1%     
==========================================
  Files          680      680             
  Lines        27427    27397     -30     
  Branches      3371     3371             
==========================================
- Hits         12824    12784     -40     
- Misses       14242    14250      +8     
- Partials       361      363      +2

Flag	Coverage Δ
#backend	7.75% <ø> (-0.26%)	⬇️
#frontend	90.19% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
api/xml/xml.go	85.62% <0%> (-2.19%)	⬇️
api/location.go	0% <0%> (ø)	⬆️

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[apburnes]

Timeouts now work as expected.

[ryanhofdotgov]

@hursey013 Does componentDidMount() get called before or after the user successfully authenticates? For example, if I just open the front page and don't sign in for 20 minutes, what will the value of lastRefresh be?

[hursey013]

@ryanhofdotgov it gets called after the form component is loaded which doesn't happen until after a successful login. From what I can see none of the timeout logic is activated on the login page itself.