Fix subscriptions import from YT as zip or standaolne .csv file

[shirrumon]

What is it?

• Bugfix (user facing)
• Feature (user facing) ⚠️ Your PR must target the refactor branch
• Codebase improvement (dev facing)
• Meta improvement to the project (dev facing)

Description of the changes in your PR

• record videos
• create clones
• take over the world

Before/After Screenshots/Screen Record

• Before:

before_fix.mp4

• After:

after_fix.mp4

Fixes the following issue(s)

• Fixes [YouTube] Subscriptions import fails under certain scenarios #13442

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.

I also tested the change locally on an emulator/device.

Tested:

• Built the debug APK successfully.
• Installed the APK on an emulator/device.
• Tried importing a YouTube Takeout subscriptions CSV/ZIP.
• Confirmed that a valid subscriptions CSV is no longer rejected only because Android reports it as application/octet-stream.
• Confirmed that the import worker no longer crashes with IndexOutOfBoundsException when the import result is empty.

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.

[shirrumon]

This fix is related to #13442

[ShareASmile]

Here is the feedback after trying the apk by the user and it doesn't work!

You should handle importing the subscriptions from YouTube & import failing from a previous subscription backup file issue (#13442) separately, preferably in two separate PRs.

Our priority is #13442 and investigation & guidance given by @Stypox in this #13347 (comment) is of important value, following the hack code given in the comment cannot be the permanent solution. Let us see what our team devs has to say on this?
@TobiGr @Stypox

[shirrumon]

Here is the feedback after trying the apk by the user and it doesn't work!

You should handle importing the subscriptions from YouTube & import failing from a previous subscription backup file issue (#13442) separately, preferably in two separate PRs.

Our priority is #13442 and investigation & guidance given by @Stypox in this #13347 (comment) is of important value, following the hack code given in the comment cannot be not the permanent solution. Let us see what our team devs has to say on this? @TobiGr @Stypox

Ok, thank you for Your response! I will deep investigate to solve the problem and i will send full fixes version as new PR.