Add Admin button in Home Page

[rohithbalaji123]

Part of #612

New Behavior

Description

Add Admin button in home page to navigate to admin panel for authorized users.

Few design thought processes:

1. Included history prop in the HomePage:
   To be able to navigate to admin panel on clicking admin button.
2. Decide admin button render based on shouldShowAdminButton state instead of feature toggle:
   When using featureToggle hoc, the button component will not be mounted again when user logs out. It will be visible when an admin user logs out.
3. isUserAdmin in ShortHTTPApi instead of AuthService:
   Adding isUserAdmin to AuthService will add a dependency for AuthService on ShortHTTPApi, but ShortHTTPApi already needs injection of AuthService. => Removed this and using includeAdminPanel feature toggle instead.

Screenshots

[codecov]

Codecov Report

Merging #828 into master will decrease coverage by 0.15%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #828      +/-   ##
==========================================
- Coverage   50.03%   49.88%   -0.16%     
==========================================
  Files         123      123              
  Lines        2650     2658       +8     
  Branches      147      149       +2     
==========================================
  Hits         1326     1326              
- Misses       1274     1282       +8     
  Partials       50       50              

Flag	Coverage Δ
#golang	70.50% <ø> (ø)
#typescript	23.49% <0.00%> (-0.17%)	⬇️

Impacted Files	Coverage Δ
frontend/src/component/App.tsx	0.00% <0.00%> (ø)
frontend/src/component/UIFactory.tsx	0.00% <0.00%> (ø)
frontend/src/component/pages/HomePage.tsx	0.00% <0.00%> (ø)
frontend/src/component/pages/shared/Header.tsx	0.00% <0.00%> (ø)

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