Check for maintenance state every 5 minutes and force refresh if changed

[kaperoo]

Description

Check for maintenance status every 5 minutes. If the status has changed from true to false - force refresh the page.

Testing instructions

Updated unit tests in App.test.tsx to check for page reloads.

• Review code
• Check Actions build
• Review changes to test coverage

Agile board tracking

connect to #1312

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (7cdaffa) 96.59% compared to head (933deb4) 96.59%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1315   +/-   ##
========================================
  Coverage    96.59%   96.59%           
========================================
  Files           47       47           
  Lines         1701     1703    +2     
  Branches       474      475    +1     
========================================
+ Hits          1643     1645    +2     
  Misses          54       54           
  Partials         4        4           

Files	Coverage Δ
src/App.tsx	87.87% <100.00%> (+0.78%)	⬆️

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[louise-davies]

Functionality works well for force-refreshing a users instance of SG. This doesn't reload the admin who unsets the maintenance mode page - but that's fine and they should know to close any instances of SG they had open before any update.