feat: view changes between app versions based on the Changelog

[kabaros]

implements HUB-160

The PR adds the ability to view an app change log:

• This is based on the CHANGELOG.md that is automatically generated for apps that use semantic-release (all of our apps)
• We will also be exposing a manual entry for each version change_summary, where the users can write whatever they want to describe what changed in a specific version
  • When that change_summary exists, it will be displayed first next to the entry (then any other changes from the changelog)

To test this: Upload a new version of one of our apps (since these have a changelog generated) - this will update the app entry with the changelog which is then parsed and used by the UI.

UI

This is based on the design here: https://docs.google.com/document/d/1hHgEgx1XI9mjha4SArmjtEGwJzQ_XihUPhfhs8mlFhw/edit?tab=t.0#heading=h.pvxbt0ldmbhq

This is the first version of the tabbed App View page - there will be further work to merge the changelog and releases history, based on the users' feedback so far.

changelog-v2.webm

obsolete versions

ignore - just leaving the video if we want to refer back
apphub-changelog-prototype.webm

[kabaros]

@cooper-joe @amcgee I marked this PR as draft, even though this implementation is ready - I tried to find a decent way to expose the changelog now that we have it, but I am not entirely convinced this is the right direction. I am happy to explore a completely different UX / concept (or few concepts) now that we have the changelog data ready.

[cooper-joe]

Thanks for the explanation @kabaros, helpful to get the context. I'm taking a look at this now, exploring some design ideas for viewing and comparing changes.

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