Remove unused old file

[adamchalmers]

I think this file was accidentally added in #978 because I changed the expectorate path halfway through development.

You can see that I clearly added two copies of api.json in the original PR:

but only one of them is used in the actual test I added there.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1029   +/-   ##
=======================================
  Coverage        ?   29.29%           
=======================================
  Files           ?       35           
  Lines           ?     1724           
  Branches        ?        0           
=======================================
  Hits            ?      505           
  Misses          ?     1219           
  Partials        ?        0           

Flag	Coverage Δ
unittests	29.29% <ø> (?)

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