Config file gitlab-ci.yml: include:local regex pattern fixed

What does this MR do and why?

Current regex pattern does not match with "template/*.yml" example string which is valid and runs without any issue. Therefore it gives error on vscode. So, I edited current include regex pattern from ^(https?://|/).+\\.ya?ml$ to ^(https?://|/?.?-?(?!\\w+://)\\w).+\\.ya?ml$.

Screenshots or screen recordings

How to set up and validate locally

GitLab documentation validates "template/example.yml" usage is correct.

Related Documentation Page

In a .gitlab-ci.yml file, import another local file/folder in the same level folder without prepend slash.

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