ci: removed changelog.json file

[svetlanabrennan]

Description

This file is not needed in this repo since it's used to generate a docs PR for a release which we do through node-newrelic repo only.

Related Issues

Related to: newrelic/node-newrelic#2106
Partially fixes: newrelic/node-newrelic#2109

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.14%. Comparing base (b392bdc) to head (c65d05a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #429   +/-   ##
=======================================
  Coverage   35.14%   35.14%           
=======================================
  Files           4        4           
  Lines         552      552           
  Branches      149      149           
=======================================
  Hits          194      194           
  Misses        329      329           
  Partials       29       29           

Flag	Coverage Δ
unit-tests	35.14% <ø> (ø)

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