feat: add Proctoring Info Panel plugin slot

[Anas12091101]

Description

This PR introduces a plugin slot to enable overriding the ProctoringInfoPanel component. It also adds a new proctoringReviewRequirementsButtonLink prop in the ProctoringInfoPanel, allowing customization of the "Review instructions and system requirements" link without requiring a full replacement of the ProctoringInfoPanel.

Screenshots

• Default
  

• Custom
  

Testing Instructions

• Override the plugin slot by pasting the following config in the env.config.jsx file

  import { DIRECT_PLUGIN, PLUGIN_OPERATIONS } from '@openedx/frontend-plugin-framework';
  
  const config = {
   pluginSlots: {
     "org.openedx.frontend.learning.proctoring_info_panel.v1":{
         plugins: [
           {
             op: PLUGIN_OPERATIONS.Insert,
             widget: {
               id: 'proctoring_info_panel',
               type: DIRECT_PLUGIN,
               RenderWidget: () => <h3>Proctoring Info Panel</h3>,
             },
           },
         ],
     }}
  }
  export default config;

• Ensure that the custom component is rendered in place of the default component.

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[arbrandes]

This is a great start, thanks! But it would be ideal if you could add:

1. An example of how to use this slot, including sample env.config.jsx code.
2. A screenshot of the slot using the above example.

[Anas12091101]

Thanks, @arbrandes!

The reason I initially left out the screenshots and env.config.jsx example was because I noticed that some of the recently added plugin slots, like ContentIFrameLoaderSlot were missing them in their README as well.

That said, I’ve now added the example screenshots and config code in 36e6ceb