Add NEW_RELIC_K8S_OPERATOR_ENABLED

[hmstepanek]

Overview

Add a configuration setting to indicate that the agent is being injected by the Kubernetes Agent Operator and that we should skip the python version safety check in sitecustomize. See agent spec for details (open PR).

[github-actions[bot]]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	bandit	4		0	5.69s
✅ PYTHON	black	10	0	0	2.23s
✅ PYTHON	flake8	10		0	1.15s
✅ PYTHON	isort	10	0	0	0.24s
✅ PYTHON	pylint	10		0	7.25s

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 72.97297% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 81.73%. Comparing base (3b46fad) to head (fc7381a).

Files	Patch %	Lines
newrelic/hooks/application_celery.py	72.41%	6 Missing and 2 partials :warning:
newrelic/bootstrap/sitecustomize.py	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop-k8s-agent-operator #1127 +/- ## ============================================================== - Coverage 81.77% 81.73% -0.04% ============================================================== Files 192 192 Lines 21303 21306 +3 Branches 3707 3706 -1 ============================================================== - Hits 17420 17414 -6 - Misses 2806 2816 +10 + Partials 1077 1076 -1 ```

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[lrafeei]

I preemptively marked this as approved, but there's some test failures (mostly timeouts for some reason)