Fix breadcrumb rendering

[core23]

Subject

The execute method was missing, so the breadcrumb was rendered as an empty block.

This is basically a soft-port of https://github.com/sonata-project/SonataBlockBundle/blob/4.x/src/Block/Service/MenuBlockService.php.

I am targeting this branch, because this is a patch for the next stable release.

Changelog

### Changed
- Mark `BaseBreadcrumbMenuBlockService ::getRootMenu` as final

### Fixed
- Fixed breadcrumb rendering

[VincentLanglet]

Thanks

[VincentLanglet]

I just merged this, but didn't you want to target 3.x instead ? @core23

[core23]

I just merged this, but didn't you want to target 3.x instead ? @core23

No, it's a bug on the next major branch.

[VincentLanglet]

Since the 3.0 is still the alpha, the "next major branch" is the 3.x one, no ?
https://github.com/sonata-project/SonataSeoBundle/releases

[core23]

Since the 3.0 is still the alpha, the "next major branch" is the 3.x one, no ? https://github.com/sonata-project/SonataSeoBundle/releases

Oh damn, you're right.

We're still on the 2.x stable branch. Must have mixed this with the other projects where the stable one is 3.x.

[VincentLanglet]

Since the 3.0 is still the alpha, the "next major branch" is the 3.x one, no ? https://github.com/sonata-project/SonataSeoBundle/releases

Oh damn, you're right.

We're still on the 2.x stable branch. Must have mixed this with the other projects where the stable one is 3.x.

A small drawback of the renaming of the branch, it's less easy to know the stable one.
I dunno, if we can do something about it to help us.

[jordisala1991]

Since the 3.0 is still the alpha, the "next major branch" is the 3.x one, no ? https://github.com/sonata-project/SonataSeoBundle/releases

Oh damn, you're right.

We're still on the 2.x stable branch. Must have mixed this with the other projects where the stable one is 3.x.

A small drawback of the renaming of the branch, it's less easy to know the stable one.

I dunno, if we can do something about it to help us.

Equalize all Sonata versions could be useful, going mono repo could help too. Other other might need to rename again branches. Maybe a hint in the readme about the main branch. 🤷🏻‍♂️