adding x-metatags to openapi spec

[georgewallace]

Release notes

What does this PR do?

This PR updates the OpenAPI spec to add the x-metatags extension. This extension adds product_name metadata which during docs build time is converted to a meta tag on the HTML page, this tag is then parsed by our internal site search to add the API docs pages to the product facets on search.

Why is it important/What is the impact to the user?

This allows users to filter their search by logstash and only see logstash apis

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files (and/or docker env variables)
• I have added tests that prove my fix is effective or that my feature works

Author's Checklist

• [ ]

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🤖 GitHub comments

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Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)

[mergify]

This pull request does not have a backport label. Could you fix it @georgewallace? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit.
• If no backport is necessary, please add the backport-skip label

[kaisecheng]

LGTM

[karenzone]

LGTM!

[jsvd]

@georgewallace this PR spawned a few backport PRs that are still open, can you merge them too? thanks