ci: removed changelog.json file

[svetlanabrennan]

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

[jsumners-nr]

Looks good to me.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.54%. Comparing base (0274452) to head (672574b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #181   +/-   ##
=======================================
  Coverage   94.54%   94.54%           
=======================================
  Files           6        6           
  Lines         385      385           
=======================================
  Hits          364      364           
  Misses         21       21           

Flag	Coverage Δ
unit-tests-16.x	41.03% <ø> (ø)
unit-tests-18.x	41.03% <ø> (ø)
unit-tests-20.x	41.03% <ø> (ø)
versioned-tests-16.x	93.24% <ø> (ø)
versioned-tests-18.x	93.24% <ø> (ø)
versioned-tests-20.x	93.24% <ø> (ø)

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