[7.x] Add $unique argument to Asset::move()

[lwekuiper]

This is a follow-up to #14236, which added Asset::moveUnique() as a non-breaking addition for 6.x.

Since master allows breaking changes, this PR removes moveUnique() and adds a $unique parameter directly to Asset::move(), consistent with how Asset::rename() already works:

$asset->move('folder', 'filename', unique: true);

[jasonvarga]

First v7 PR! 🎉

I've just brought master up to date with 6.x if you'd like to fix the conflicts and remove the moveUnique method. (or reopen the PR if that's easier for you)

[lwekuiper]

First v7 PR! 🎉

That's actually pretty cool 🥳 The PR is now updated!

[jasonvarga]

There's a bunch of unnecessary formatting changes. (e.g. added newlines, renaming unrelated test methods with_events->withEvents).

The moveQuietly method also needs the $unique parameter. Technically it works because it forwards arguments but it should be added.

[lwekuiper]

Right, that was my automatic Pint formatting, I'll make sure future PRs don't include this.

This is now cleaned up and the $unique parameter is added to moveQuietly().

[jasonvarga]

Thanks!