feat: add parallel flag

[ChristopherHX]

• limits matrix jobs as well
• exempt limits by using --parallel -1
• only the stage planner limits now concurrency

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ REPOSITORY	gitleaks	yes		no	no	2.45s
✅ REPOSITORY	git_diff	yes		no	no	0.01s
✅ REPOSITORY	grype	yes		no	no	21.93s
✅ REPOSITORY	secretlint	yes		no	no	1.23s
✅ REPOSITORY	syft	yes		no	no	1.29s
✅ REPOSITORY	trivy-sbom	yes		no	no	3.05s
✅ REPOSITORY	trufflehog	yes		no	no	4.13s

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

[codecov]

Codecov Report

Attention: Patch coverage is 78.57143% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pkg/runner/run_context.go	62.50%	2 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ
cmd/input.go	88.46% <ø> (ø)
cmd/root.go	59.88% <100.00%> (+2.31%)	⬆️
pkg/runner/runner.go	89.88% <100.00%> (+2.04%)	⬆️
pkg/runner/run_context.go	80.16% <62.50%> (-0.26%)	⬇️

... and 13 files with indirect coverage changes

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