Change default setting to `allow_core_minor_updates` to true

We could considering doing this for the 2.x branch but the default value for core will false

That would work I guess.

But I think that since #9, the conclusion has changed to "don't do any contrib-only things, only do core-mvp things", so my concerns in #10 are moot at this point — at least until the time we choose to land this.

MR needs to be re-created on top of 3.0.x.

Hi I just rebased.

I tryed to copy the changes to a branch from version 3.0.X ingoring the commits from 8.X-2.X

The file tests/src/Functional/UpdatePathTest.php doesn't exist in this branch.

I am not sure about automatic_updates.install because the automatic_updates_update_last_removed points to 9002 and this patch adds 9903.

Please review

Locally the failed test passes, so I am unable to fix it, sorry.
moving to needs work.