Add supported boolean key to branch entities

Closes #3524717

As part of this, we'd also want to display a box with the Supported message when viewing the different pages. The templates can be found here: https://git.drupalcode.org/project/api/-/tree/2.x/templates

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• d041a1a8 - fix accidental phpcs issues

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• 6d54adb9 - One more phpcs issue :)

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• 9848b739 - Adding a twig implementation for the sake of discussion :)

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resolved all threads

We might need to add something like this in other templates. Maybe it can be made a re-usable template where we just need to pass the branch.

changed this line in version 5 of the diff

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• 06e58c21 - Replace branch twig based docs with a more generic message based one driven...

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• 383fc879 - Also added alternate handling to lead to current branch same item or current...

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• 973cdb4a - - Make the message more readable, less tech jargon, like Symfony

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• 9a184ef0 - Fix phpcs and phpstan complaints

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