Add GitHub Markdown test report templates

[yusufhay]

Summary

• Add GitHub Markdown versions of the issue reproduction report template
• Add GitHub Markdown versions of bug/defect and feature/enhancement patch test templates
• Add GitHub Markdown versions of the combined report templates

Testing

• git diff --check

Fixes #3

[github-actions]

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Co-authored-by: yusufhay <yusufmudagal@git.wordpress.org>
Co-authored-by: lancewillett <lancewillett@git.wordpress.org>
Co-authored-by: Successfulsebunya <mosescursor@git.wordpress.org>
Co-authored-by: ironprogrammer <ironprogrammer@git.wordpress.org>

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[huzaifaalmesbah]

I think we don’t need any changes on the combined-report page now because we’ve already moved this page to the archive.

Please revert the changes made to: archive/archived-test-reports/combined-report.md