chore: attempt to update server settings to allow for local testing of sites in iframes

[janechu]

Description

This allows sites to be referred to from a localhost environment.

Motivation & context

This should help with testing sites in iframes when used in localhost.

Issue type checklist

• Chore: A change that does not impact distributed packages.
• Bug fix: A change that fixes an issue, link to the issue above.
• New feature: A change that adds functionality.

Is this a breaking change?

• This change causes current functionality to break.

Adding or modifying component(s) in @microsoft/fast-components checklist

• I have added a new component
• I have modified an existing component
• I have updated the definition file
• I have updated the configuration file

Process & policy checklist

• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.

[awentzel]

This was previously set and found to be a security violation so I removed it. However, I didn't try setting a single attribute.

Rather, than let this PR go in and then have to revert, we can try this out on the creator staging site if you want? I can update directly on the server and then rescan, if it works great, we can let this change go in. If not, then we should find a secure solution.

[janechu]

@awentzel that would be great!

[awentzel]

@awentzel that would be great!

Please try testing on https://stage.create.fast.design which now has your code implemented directly. Thanks

[codeclimate]

Code Climate has analyzed commit e91ec82 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 85.2% (0.0% change).

View more on Code Climate.

[awentzel]

Resolved by #4572 after manually testing.