Enable hidden file uploads for coverage

[TimPansino]

Overview

• Fix coverage upload by enabling include-hidden-files: true on actions/upload-artifact
• Include if-no-files-found: error to prevent future issues.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	6		0	0	0.45s
✅ MARKDOWN	markdownlint	7	0	0	0	0.94s
✅ MARKDOWN	markdown-link-check	7		0	0	8.9s
✅ PYTHON	ruff	901	0	0	0	0.56s
✅ PYTHON	ruff-format	901	0	0	0	0.35s
✅ YAML	prettier	13	0	0	0	1.24s
✅ YAML	v8r	13		0	0	7.33s
✅ YAML	yamllint	13		0	0	0.56s

See detailed report in MegaLinter reports

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.58%. Comparing base (68da5b7) to head (f735b16).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1370      +/-   ##
==========================================
+ Coverage   80.00%   81.58%   +1.58%     
==========================================
  Files         204      204              
  Lines       22952    22952              
  Branches     3639     3639              
==========================================
+ Hits        18362    18726     +364     
+ Misses       3392     3014     -378     
- Partials     1198     1212      +14     

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