Add Align support to Separator block

[jordesign]

Description

Added support for Align controls (limited to Wide and Full) to Separator block
Addresses #25080

How has this been tested?

Tested in Local (by Flywheel) on Mac OSX in Chrome/Safari.

Tested with TwentyTwenty theme which renders elements as expected (with good theme support for wide end full alignment).

Screenshots

Types of changes

Change to existing core block - adding additional functionality/support

Checklist:

• My code is tested.
• [ x] My code follows the WordPress code style.
• [x ] My code follows the accessibility standards.

[ItsJonQ]

@jordesign Haii! Thanks for working on this one :)

I took it for a spin locally. I think we may need center align there as well.

My thinking is it can serve as the "default". Just in case you update to wide or full, and you want to change it back to the original:

I don't think we need both align: true and align: [...] 🤔

Hope this was helpful!

[jordesign]

Thanks @ItsJonQ - I'm amended that and have an update to the PR

[ItsJonQ]

🚀 Thanks @jordesign ! With that change, it looks good to me :)

[ItsJonQ]

@jordesign Hmm! Before I merge this. I had a question!

Do we need the html: false setting for any reason?

I'm not too familiar with that property. Briefly poking at the other blocks (via code search), I couldn't find many instances of html: false. Just wanted to double check

Thanks!

[ItsJonQ]

@jordesign Haii! Just checked. I think we need to remove "html": false

[jordesign]

Thanks @ItsJonQ - updated now

[ItsJonQ]

@jordesign Great! Thank you for the speedy adjustments 🙏

[ItsJonQ]

The E2E tests are failing... However, I believe we're having E2E testing issues all around.
I'm 99.9999% certain the failures are unrelated to this PR update.

Will proceed with merging.

Thanks again @jordesign !

[ZebulanStanphill]

@ItsJonQ To reset to the default, you click the currently-selected option. Arguably, there should be an explicit "unset"/"default" option in these kind of dropdown menus, but that's something that should be addressed for all instances of this kind of menu.