Remove Python2.7 support

[hmstepanek]

Overview

Remove Python2.7 support.

[github-actions[bot]]

🦙 MegaLinter status: ❌ ERROR

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ MARKDOWN	markdownlint	1	0	0	0.48s
✅ MARKDOWN	markdown-link-check	1		0	1.12s
❌ PYTHON	bandit	145		11	22.23s
✅ PYTHON	black	483	220	0	33.17s
❌ PYTHON	flake8	483		292	12.65s
✅ PYTHON	isort	483	261	0	1.3s
❌ PYTHON	pylint	483		887	108.68s
✅ YAML	prettier	2	0	0	0.5s
✅ YAML	v8r	2		0	4.27s
✅ YAML	yamllint	2		0	0.57s

See detailed report in MegaLinter reports _Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff_

_MegaLinter is graciously provided by _

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 75.82205% with 125 lines in your changes missing coverage. Please review.

Project coverage is 81.24%. Comparing base (a6830a9) to head (f006351).

Files with missing lines	Patch %	Lines
newrelic/core/application.py	23.07%	20 Missing :warning:
newrelic/api/transaction.py	58.97%	16 Missing :warning:
newrelic/config.py	51.85%	8 Missing and 5 partials :warning:
newrelic/core/agent.py	23.52%	12 Missing and 1 partial :warning:
newrelic/bootstrap/sitecustomize.py	0.00%	6 Missing :warning:
newrelic/network/addresses.py	0.00%	5 Missing :warning:
newrelic/core/profile_sessions.py	60.00%	4 Missing :warning:
newrelic/common/object_names.py	72.72%	3 Missing :warning:
newrelic/core/config.py	80.00%	2 Missing and 1 partial :warning:
newrelic/core/stats_engine.py	84.21%	3 Missing :warning:
... and 33 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1215 +/- ## ========================================== - Coverage 81.43% 81.24% -0.20% ========================================== Files 197 197 Lines 21872 21601 -271 Branches 3830 3776 -54 ========================================== - Hits 17811 17549 -262 + Misses 2924 2912 -12 - Partials 1137 1140 +3 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.