Allow Runtime Configuration

[alexjmpb]

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.
• Update the footer and header to avoid peer dependency errors.
• Create a component Head, that uses Helmet library and integrates internationalization to change the MFE name in the title tag according to the language, and change the favicon in runtime.
• Add react-helmet, enzyme and enzyme-adapter-react-16.

Screenshot

In progress

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 

https://github.com/openedx/edx-platform/pull/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

[dcoa]

Close in favor of #104