seo scan update

[akuny]

Update seo scan to also check http response headers for hreflang codes

[github-actions]

MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ CREDENTIALS	secretlint	yes		no	2.22s
✅ GIT	git_diff	yes		no	0.01s
✅ TYPESCRIPT	eslint	1	0	0	6.16s

See errors details in artifact MegaLinter reports on CI Job page
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff