Surfacing warnings during successful runs

[bdovaz]

Changed code so that the console shows a new tab called "warnings" which shows a list of warnings. Added the regex to .yaml files for both errors and warnings as a way to display the warnings
Even when there are no errors, warnings will now show in the console and be displayed
Developers can also add their own regex to each descriptor to count warnings

TODO: Add the warnings to additional reporters

Fixes #4476

Proposed Changes

1. New schema additions, regex of warnings and warning count
2. Warning displayed on the console and other reporters in the future
3. .yaml file regex as yaml linter can very easily be counted

Readiness Checklist

Run megalinter and there should now be a warning tab. Only .yaml files at the current moment support the counting of warnings. Other files will need additional regex to be written.

Author/Contributor

• Add entry to the CHANGELOG listing the change and linking to the corresponding issue (if appropriate)
• If documentation is needed for this change, has that been included in this pull request

Reviewing Maintainer

• Label as breaking if this is a large fundamental change
• Label as either automation, bug, documentation, enhancement, infrastructure, or performance

[github-actions]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ API	spectral	1		0	0	1.7s
⚠️ BASH	bash-exec	6		1	0	0.05s
✅ BASH	shellcheck	6		0	0	0.25s
✅ BASH	shfmt	6	0	0	0	0.89s
✅ COPYPASTE	jscpd	yes		no	no	2.88s
✅ DOCKERFILE	hadolint	129		0	0	33.68s
✅ JSON	jsonlint	20		0	0	0.2s
✅ JSON	v8r	22		0	0	14.31s
⚠️ MARKDOWN	markdownlint	267	0	302	0	23.17s
✅ MARKDOWN	markdown-table-formatter	267	0	0	0	169.26s
⚠️ PYTHON	bandit	215		66	0	3.12s
✅ PYTHON	black	215	0	0	0	5.51s
✅ PYTHON	flake8	215		0	0	2.06s
✅ PYTHON	isort	215	0	0	0	1.32s
✅ PYTHON	mypy	215		0	0	11.59s
✅ PYTHON	pylint	215		0	0	34.8s
✅ PYTHON	ruff	215	0	0	0	0.64s
✅ REPOSITORY	checkov	yes		no	no	39.07s
✅ REPOSITORY	git_diff	yes		no	no	0.79s
⚠️ REPOSITORY	grype	yes		31	no	14.6s
✅ REPOSITORY	secretlint	yes		no	no	12.31s
✅ REPOSITORY	trivy	yes		no	no	15.74s
✅ REPOSITORY	trivy-sbom	yes		no	no	0.75s
⚠️ REPOSITORY	trufflehog	yes		1	no	55.51s
✅ SPELL	cspell	718		0	0	12.55s
⚠️ SPELL	lychee	349		28	0	6.6s
✅ XML	xmllint	3	0	0	0	0.9s
✅ YAML	prettier	160	0	0	0	4.62s
✅ YAML	v8r	102		0	0	31.03s
✅ YAML	yamllint	161		0	0	3.45s

See detailed report in MegaLinter reports

[bdovaz]

Ready for review!

I see this PR as a great achievement for “warning as error” fans like me.

cc @nvuillam @echoix

[echoix]

I didn't go into too much detail , but I assume that this handles the cases when errors as warnings is used (because I saw that you use the yellow triangle, but it was already used)

[nvuillam]

Looks like a quality PR :)

Maybe also handle the retrieve of warnings when output is SARIF ?