Support 2u teams through deployment of first upgraded mfe

[chris1tapia]

[PKulkoRaccoonGang]

@chris1tapia we deployed three configuration options for cross-team testing. Can we consider this task completed?

• feat: MFE runtime configuration API frontend-app-discussions#724
• feat: Using locally installed Paragon CSS frontend-app-discussions#723
• testing: Using Paragon CSS External Hosting (JavaScript-based configuration) frontend-app-discussions#707

[adamstankiewicz]

[inform] From 2U/edX.org's side, the remainder of the work related to this the design tokens migration before 2U/edX.org frontends can begin consuming tokens on our deployed instances, includes the following:

• Finish migration to tokens in @edx/brand-edx.org.
• Finish migration to tokens in @edx/frontend-component-header-edx.
• Finish migration to tokens in @edx/frontend-component-footer-edx.
• Ensure ingestion of Paragon CDN URLs via @edx/frontend-platform supports Subresource Integrity (SRI) as a security improvement when working with external CDNs (Compatibility with Subresource Integrity (SRI) in consuming Paragon CSS via external CDN #3139).