EMA: Fix proxyEditModeURL Query Param for Edit Mode Anywhere

[fmontes]

Problem Statement

In Edit Mode Anywhere the querey param proxyEditModeURL to override the EMA url is not working.

Steps to Reproduce

1. Set EMA
2. Edit a page and add to the url &proxyEditModeURL=https://other-server.com
3. See how it doesn't override the URL

Acceptance Criteria

• The query param proxyEditModeURL should override the EMA url
• The URL provided in the query param should be used instead of the default EMA url
• This needs to be fixed in the old plugin as well so outdated customers can use it.

External Links

None

Assumptions & Initiation Needs

We need to make sure the query param works in both the plugin and in the core.

Quality Assurance Notes & Workarounds

Testers need to verify that the query param correctly overrides the EMA url. As a workaround, testers can manually enter the URL instead of using the query param.

[bryanboza]

Fixed, tested on master and now it is working as expected. Now we are able to override the default EMA configuration, via a parameter in the navigation URL.