Disable ML inference events capture by default.

[umaannamalai]

This PR disables machine_learning.inference_events_value.enabled by default.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	bandit	1		0	5.21s
✅ PYTHON	black	1	0	0	0.75s
✅ PYTHON	flake8	1		0	0.45s
✅ PYTHON	isort	1	0	0	0.2s
✅ PYTHON	pylint	1		0	3.01s

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[codecov-commenter]

Codecov Report

Merging #924 (247cbb4) into develop-scikitlearn (3465cdd) will not change coverage.
The diff coverage is n/a.

@@                 Coverage Diff                  @@
##           develop-scikitlearn     #924   +/-   ##
====================================================
  Coverage                81.75%   81.75%           
====================================================
  Files                      190      190           
  Lines                    19581    19581           
  Branches                  3401     3401           
====================================================
  Hits                     16008    16008           
  Misses                    2590     2590           
  Partials                   983      983           

Files Changed	Coverage Δ
newrelic/core/config.py	94.21% <ø> (ø)

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