Fix ButtonCollectionType groups splitting

[jolelievre]

Questions	Answers
Branch?	develop
Description?	Fix ButtonCollectionType groups splitting that was broken by inline_buttons_limit feature, the children were rendered multiple times so not displayed in the appropriate group div But more important in recent Symfony version a form cannot be rendered twice and hat used to fail silently now shouts about it (which is a good thing)
Type?	bug fix
Category?	BO
BC breaks?	no
Deprecations?	no
How to test?	See issue #34197
UI Tests
Fixed issue or discussion?	Fixes #34197
Related PRs	~
Sponsor company	~

[prestonBot]

Hi, thanks for this contribution!

I found some issues with the Pull Request description:

• Your pull request does not seem to fix any issue, consider creating one (see note below) and linking it by writing Fixes #1234.

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[florine2623]

Hello @jolelievre ,

Test autos OK : https://github.com/florine2623/testing_pr/actions/runs/6572288276

Tested the standard case.
Checked the following :

• standard case with multigroup shops
• duplicate product
• switch from shop to shop using Select Store button + shop banner

QA OK ✅

[prestonBot]

QA approved, well done! Message to the maintainers: do not forget to milestone it before the merge.