feat(marketplace): allow plugins to extend the plugins page

[christoph-jerolimov]

Description

This change will allow the marketplace plugin to extend the existing Admin > Plugins page with a new internal.plugins/tab.

This is an interim solution until we remove the current installed plugins page (in 1.6, 1.7, ...)

The expectation is that the page looks similar to before when no other internal.plugins/tab mount point is specified!

Local:

With an additional internal.plugins/tab it can look like this:

Via an extra marketplace tab config:

    red-hat-developer-hub.backstage-plugin-marketplace:
      appIcons:
        - name: marketplace
          importName: MarketplaceIcon
      dynamicRoutes:
        - path: /plugins/marketplace
          importName: InternalPluginInfoTab
      mountPoints:
        - mountPoint: internal.plugins/tab
          importName: InternalPluginInfoTabContent
          config:
            path: marketplace
            title: Marketplace

Notice that this YAML depends on the latest change in this WIP PR redhat-developer/rhdh-plugins#401

Which issue(s) does this PR fix

• Fixes https://issues.redhat.com/browse/RHIDP-5947

PR acceptance criteria

Please make sure that the following steps are complete:

• GitHub Actions are completed and successful
• Unit Tests are updated and passing
• E2E Tests are updated and passing
• Documentation is updated if necessary (requirement for new features)
• Add a screenshot if the change is UX/UI related

How to test changes / Special notes to the reviewer

1. It's mostly important that the plugins page works as before!
2. If you like you can clone rhdh-plugins, checkout PR and install the marketplace into your local rhdh.

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[github-actions]

The image is available at:

• quay.io/rhdh-community/rhdh:pr-2358 or
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[divyanshiGupta]

@christoph-jerolimov I checked out this PR and enabled the marketplace dynamic plugins. Plugins page seems to work fine but marketplace doesnt seem to load properly. I was just trying to test even with the marketplace plugins in place the Plugins page works fine or not. Am I missing something?

Screen.Recording.2025-02-12.at.2.17.55.PM.mov

[gashcrumb]

Yep, I think this works for me as a sufficiently specific way of mapping where these components need to go now and in the future. Maybe we can just kind of avoid advertising these internal mount points too much 😄

[github-actions]

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