[PR] Show changelog before performing the update

[antoniokupresak]

How can the enhancement be summarized in two to three sentences?

We want to show all changelogs between the currently installed version and the version that the user is going to update to.

How does the system behave currently (before applying the enhancement)?

After clicking on the update button it immediately starts downloading and installing the update.

How should the system behave once the enhancement is implemented?

Open a new dialogue after clicking on the update button that shows all changelog entries since the currently installed version that (once again) prompts the user to click on "Update" or "Cancel" otherwise.

How could this be implemented?

Simply display all changelog entries between the two versions.

I was inspired by the following update preview built in in OxygenOS (the Android mode used by OnePlus)

As discussed in Slack, this might be suitable as a "Probetagsaufgabe".