fix: course sidebar slot

[rpenido]

Description

This PR fixes the rendering of the slot org.openedx.frontend.authoring.course_outline_sidebar.v1 while using Insert operation.

Supporting information

• More info here: https://openedx.slack.com/archives/C049JQZFR5E/p1778531073403519?thread_ts=1777970505.889649&cid=C049JQZFR5E
• Similar to fix: course unit sidebar slot #3055

Testing instructions

• Use the following env.config.jsx

import { PLUGIN_OPERATIONS, DIRECT_PLUGIN } from '@openedx/frontend-plugin-framework';

import { Card } from "@openedx/paragon"

const config = {
  pluginSlots: {
    'org.openedx.frontend.authoring.course_outline_sidebar.v1': {
      keepDefault: true,
      plugins: [
        {
          op: PLUGIN_OPERATIONS.Insert,
          widget: {
              id: 'course-sidebar',
              priority: 1,
              type: DIRECT_PLUGIN,
              RenderWidget: () => <Card><Card.Header title="v1"/></Card>,
          },
        },
        {
            op: PLUGIN_OPERATIONS.Wrap,
            widgetId: 'default_contents',
            wrapper: ({component}) => <div style={{ border: 'thick dashed green' }}>{component}</div>,
        },
      ],
    },
  },
};

export default config;

• Check that the v1 card is rendered before the sidebar, and you have a green dashed line around the sidebar.

Best Practices Checklist

We're trying to move away from some deprecated patterns in this codebase. Please
check if your PR meets these recommendations before asking for a review:

• Any new files are using TypeScript (.ts, .tsx).
• Avoid propTypes and defaultProps in any new or modified code.
• Tests should use the helpers in src/testUtils.tsx (specifically initializeMocks)
• Do not add new fields to the Redux state/store. Use React Context to share state among multiple components.
• Use React Query to load data from REST APIs. See any apiHooks.ts in this repo for examples.
• All new i18n messages in messages.ts files have a description for translators to use.
• Avoid using ../ in import paths. To import from parent folders, use @src, e.g. import { initializeMocks } from '@src/testUtils'; instead of from '../../../../testUtils'

[openedx-webhooks]

Thanks for the pull request, @rpenido!

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.52%. Comparing base (0188698) to head (809740c).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3056   +/-   ##
=======================================
  Coverage   95.52%   95.52%           
=======================================
  Files        1393     1393           
  Lines       32969    32969           
  Branches     7592     7599    +7     
=======================================
  Hits        31493    31493           
- Misses       1408     1421   +13     
+ Partials       68       55   -13     

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