[EY] Support CORS for GraphQL

[magento-engcom-team]

As a web developer, I want Magento to support the CORS standard:

https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS

so that I can develop my applications according to defined best practices. 

Use env for settings not system config

Other Issues:

Related issue: https://github.com/magento/magento2/issues/28561 (original issue: #8399)

Acceptance Criteria:

Implement CORS support as detailed here: https://enable-cors.org/server.html

[magento-engcom-team]

The issue was exported from the internal JIRA. The link to the original JIRA issue: https://jira.corp.magento.com/browse/MC-39743

[m2-assistant]

Hi @magento-engcom-team. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

• Summary of the issue
• Information on your environment
• Steps to reproduce
• Expected and actual results

Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento give me 2.4-develop instance - upcoming 2.4.x release

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Please, add a comment to assign the issue: @magento I am working on this

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