feat: implement showPreferences flag in notification preferences

[awais-ansari]

INF-952

• Hide and show the notification preferences according to the showPreferences flag.

[codecov]

Codecov Report

Patch coverage: 62.50% and project coverage change: +1.26 🎉

Comparison is base (c75dc86) 44.87% compared to head (13a7508) 46.13%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #828      +/-   ##
==========================================
+ Coverage   44.87%   46.13%   +1.26%     
==========================================
  Files         121      121              
  Lines        2525     2525              
  Branches      668      666       -2     
==========================================
+ Hits         1133     1165      +32     
+ Misses       1314     1284      -30     
+ Partials       78       76       -2     

Impacted Files	Coverage Δ
src/account-settings/AccountSettingsPage.jsx	1.40% <0.00%> (-0.01%)	⬇️
src/index.jsx	0.00% <ø> (ø)
src/notification-preferences/data/reducers.js	93.33% <ø> (ø)
src/notification-preferences/data/thunks.js	12.96% <0.00%> (ø)
src/notification-preferences/messages.js	100.00% <ø> (ø)
src/account-settings/JumpNav.jsx	90.00% <100.00%> (ø)
src/notification-preferences/data/selectors.js	100.00% <100.00%> (ø)

... and 10 files with indirect coverage changes

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