Allow for preconnect, dns-prefetch and other link tags

[navarr]

Adding simple tags like <link rel="preconnect" href="//cdn-ws.turnto.com"/> currently requires a block and template, but could easily be injected into the head through layout updates

Description (*)

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes magento/magento2#<issue_number>

Manual testing scenarios (*)

1. ...
2. ...

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

Resolved issues:

1. resolves [Issue] Allow for preconnect, dns-prefetch and other link tags #32380: Allow for preconnect, dns-prefetch and other link tags

[m2-assistant]

Hi @navarr. Thank you for your contribution
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[tanghongtanghong]

_![image](https://user-images.githubusercontent.com/50584758/109270060-7290c200-7848-11eb-9edb-dc5513b7d8e0.png)_

[gabrieldagama]

@magento run all tests

[gabrieldagama]

@magento create issue

[engcom-Hotel]

@magento run all tests

[engcom-Charlie]

@magento run all tests

[engcom-Charlie]

Hi @navarr,

Thank you for the contribution!

I have raised a internal approval JIRA for the SVC failure. Moving this PR to Pending Approval now. We will proceed ahead on this once will get all the required approvals.