Unleash / unleash / 27938684972

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task: update coep header to be credentialless, i.e. not include cooki… (#12374)

…es for cross-origin requests

## About the changes

Since the only requests we're making without cors seem to be avatars,
stylesheets and favicons, this PR forces us to make the requests without
including our cookies (i.e. set it to credential-less).

### Important files

## Discussion points

## OSS PR checklist

- [x] I have read and agree to the [Unleash Contributor License
Agreement](https://github.com/Unleash/unleash/blob/main/CLA.md).
- [x] I have added tests or explained why tests are not needed.
- [x] I have updated documentation where relevant.

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