Fix JSON Encoding of Path Objects to Call str()

[TimPansino]

Overview

• Fixes TypeErrors caused by calling newrelic.common.encoding_utils.json_encode() on a Path object by converting to a string representation of the Path.
• Add tests for json_encode() for all supported types to prevent regressions.

Testing

from pathlib import Path
from newrelic.common.encoding_utils import json_encode

p = Path("/test/path/file.py")
d = {"path": p}

print(repr(d))
print(repr(json_encode(d)))

{'path': PosixPath('/test/path/file.py')}
'{"path":"/test/path/file.py"}'

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	6		0	0	0.72s
✅ MARKDOWN	markdownlint	7	0	0	0	1.24s
✅ MARKDOWN	markdown-link-check	7		0	0	15.89s
✅ PYTHON	ruff	922	0	0	0	0.88s
✅ PYTHON	ruff-format	922	0	0	0	0.35s
✅ YAML	prettier	13	0	0	0	1.37s
✅ YAML	v8r	13		0	0	5.78s
✅ YAML	yamllint	13		0	0	0.63s

See detailed report in MegaLinter reports

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.35%. Comparing base (cf06bc9) to head (56c54ed).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1436      +/-   ##
==========================================
+ Coverage   81.33%   81.35%   +0.01%     
==========================================
  Files         208      208              
  Lines       23563    23566       +3     
  Branches     3716     3717       +1     
==========================================
+ Hits        19166    19173       +7     
+ Misses       3138     3135       -3     
+ Partials     1259     1258       -1     

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