feat: allow runtime configuration

[dcoa]

Description

This PR is part of the work to make it possible to configure the frontend applications at runtime (you can referer to this openedx/wg-frontend#103).

Changes

• Update frontend-platform to version 2.5.1
• Use Helmet library to change the favicon in runtime.
• Use getConfig() to insert configuration.

Screenshot

Values come from runtime configuration

How to test

• To allow runtime configuration set a new environment variables MFE_CONFIG_API_URL and APP_ID in the env file and add the api url ( To test this you can use the API from this feat: add mfe config api edx-platform#30473 or use an external tool to mock the API response).
• The API should respond with a JSON with the config values, something like:

{
  "SITE_NAME": "Test Site",
  "LOGO_URL": "https://testimage.com/logo.svg",
  "LOGO_TRADEMARK_URL": "https://testimage.com/logo.svg",
  "LOGO_WHITE_URL": "https://testimage.com/logo.svg",
  "FAVICON_URL": "https://testimage.com/favicon.ico",
}

• The initialize process should work normally.
  Note: You can combine buildtime and runtime configuration

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[mphilbrick211]

@azanbinzahid could you please review and enable tests to run?

[Ali-D-Akbar]

Haven't tested on local but the changes look good.

[dcoa]

Thanks, @Ali-D-Akbar, and @ansabgillani for your review.

Let me know if you need more information to merge it. :)

C.C @arbrandes

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