Adds the volto.blocks behavior to LRF if plone.volto is installed

[wesleybl]

During the installation of plone.app.multilingual, checks if plone.volto is installed. If it is, adds the volto.blocks behavior to LRF.

I didn't add plone.volto as a test dependency.

Closes plone/Products.CMFPlone#4238

[mister-roboto]

@wesleybl thanks for creating this Pull Request and helping to improve Plone!

TL;DR: Finish pushing changes, pass all other checks, then paste a comment:

@jenkins-plone-org please run jobs

To ensure that these changes do not break other parts of Plone, the Plone test suite matrix needs to pass, but it takes 30-60 min. Other CI checks are usually much faster and the Plone Jenkins resources are limited, so when done pushing changes and all other checks pass either start all Jenkins PR jobs yourself, or simply add the comment above in this PR to start all the jobs automatically.

Happy hacking!

[wesleybl]

@mauritsvanrees @davisagli @gforcada It seems the native namespace is causing problems in Plone 6.2.

[wesleybl]

The problem might be that the plone.app.multilingual version of Plone 6.1 still uses legacy namespaces. It wouldn't be compatible for testing with the native namespace-based Plone 6.2 products. Perhaps it's not worth testing this branch with Plone 6.2.

[wesleybl]

@jenkins-plone-org please run jobs

[wesleybl]

In fact, it would be necessary to modify all the Plone 6.1 packages that are tested with Plone 6.2 😲

[davisagli]

@wesleybl Plone 6.2 uses the master branch of this package. We should remove 6.2 from the testing matrix for the 8.x branch. /cc @gforcada

[wesleybl]

@jenkins-plone-org please run jobs

[erral]

LGTM

[erral]

We should forward-port this to main too @wesleybl

[davisagli]

I think this makes sense. We do need a PR for the master branch too.

[wesleybl]

@jenkins-plone-org please run jobs