Add support for channel's `Courses` tab

[ChunkyProgrammer]

Add support for channel's Courses tab

Pull Request Type

• [x] Bugfix - fixes some issues with podcasts and releases as well
• [x] Feature Implementation - add support for channel's Courses tab

Related issue

https://github.com/iv-org/invidious/issues/5144

Dependent on: https://github.com/LuanRT/YouTube.js/pull/883 https://github.com/iv-org/invidious/pull/5158

Description

This PR adds support for the courses tab on the channel page for both local api and Invidious API

Screenshots

Testing

test 1

• enter this url https://www.youtube.com/@InfinityLearn_NEET/courses
• be navigated to courses tab

test 2

• enter this url https://www.youtube.com/@InfinityLearn_NEET/
• switch to courses tab

test 3

• hide courses tab in distraction free settings
• go to https://www.youtube.com/@InfinityLearn_NEET
• don't see courses tab

Desktop

• OS: Fedora Linux
• OS Version: 41
• FreeTube version: latest nightly

[absidue]

As a YouTube.js update with the required changes was released and is being used on the development branch, what would you like to do with this pull request? Wait until the changes on the Invidious side are merged or proceed with a local API implementation first and follow up with an Invidious implementation once the relevant changes have landed on their side?

[github-actions[bot]]

This pull request has conflicts, please resolve those before we can evaluate the pull request.

[github-actions[bot]]

Conflicts have been resolved. A maintainer will review the pull request shortly.

[ChunkyProgrammer]

Error with IV API when navigating towards this courses playlist VirtualBoxVM_2Zd9PiFHIR.mp4

Error with the Local API when starting to watch the courses playlist VirtualBoxVM_8WkCfT3lLT.mp4

The error with invidious api is a bug in invidious (seems to be because you have to pay to watch one of the videos). See: https://inv.nadeko.net/playlist?list=PLmdFyQYShrjfOiKmTtgQFsdorN-0Aq2uJ in a browser

The local api error is because we have the same video showing up multiple times in the playlist

(both of these issues can happen outside of this PR)