Fix Celery Instrumentation for Workers

[TimPansino]

Overview

• Celery apps run with worker optimizations would overwrite instrumentation wrappers.
• This has been corrected by instrumenting the setup and reset methods to always ensure our wrapper is always applied, is never duplicated, and is always the top wrapper for BaseTask.call
• Add new tests file for wrapper unit tests with new test for worker optimizations.
• Run task method tests with and without worker optimizations.
• Fix bug in @validate_transaction_count where state from previous tests is never cleared.

[github-actions[bot]]

🦙 MegaLinter status: ❌ ERROR

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	bandit	2		0	5.55s
✅ PYTHON	black	5	3	0	2.09s
❌ PYTHON	flake8	5		3	1.07s
✅ PYTHON	isort	5	4	0	0.31s
✅ PYTHON	pylint	5		0	6.55s

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.42857% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 81.71%. Comparing base (df2b159) to head (2a88b39).

Files	Patch %	Lines
newrelic/hooks/application_celery.py	70.37%	3 Missing and 5 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1133 +/- ## ========================================== - Coverage 81.74% 81.71% -0.03% ========================================== Files 192 192 Lines 21304 21323 +19 Branches 3706 3710 +4 ========================================== + Hits 17415 17425 +10 - Misses 2813 2819 +6 - Partials 1076 1079 +3 ```

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