Mocks - Include Base.id in GraphQL response for Apollo cache key

[pylipp]

https://trello.com/c/qeW6UDVJ

follow-up for 8db55c9

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.23%. Comparing base (8db55c9) to head (d546286).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2921   +/-   ##
=======================================
  Coverage   74.23%   74.23%           
=======================================
  Files         332      332           
  Lines       25447    25447           
  Branches     2535     2534    -1     
=======================================
  Hits        18890    18890           
  Misses       6507     6507           
  Partials       50       50           

Flag	Coverage Δ
backend	99.65% <ø> (ø)
frontend	66.80% <ø> (ø)
sharedComponents	44.29% <ø> (ø)
sharedFront	91.72% <ø> (ø)

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