Add button for checking updates to error screen

[ghost]

What is it?

• Feature (user facing) ⚠️ Your PR must target the refactor branch

Description of the changes in your PR

Add buttton for checking for updates

Before/After Screenshots/Screen Record

• Before:

• After:

untitled.mp4

Fixes the following issue(s)

• Fixes Show a button/link for the app’s last update as part of the error screen #13214

Relies on the following changes

• Show toast "checking for update..." every time user starts manual check #13229

APK testing

The APK can be found by going to the "Checks" tab below the title. On the left pane, click on "CI", scroll down to "artifacts" and click "app" to download the zip file which contains the debug APK of this PR. You can find more info and a video demonstration on this wiki page.

Due diligence

• I read the contribution guidelines.
• The proposed changes follow the AI policy.
• I tested the changes using an emulator or a physical device.

[ghost]

Don't mind that video shows you the button on "age restricted error page" it was just made mock testing. The code in PR is coupled to report button so the button is howed only when error is reportable

[hollownights]

Hi!

Two things:

• No button should ever disappear. It may be grayed out/disabled to for a while after a click, but never disappear.
• Without a proper call to action and an indication that it may lead to a solution to the problem, the button loses its appeal. So:

(Only if the automatic check for updates is disabled)
There may be a new version of NewPipe that may solve this problem. Click the button below to check for it:

[Check for updates]

(If the automatic check for updates is enabled, check for updates and, if there is one, show this)
There is a new version of NewPipe that may solve this problem. Click the button below to download it:

[Update the app]