[Form][ButtonBuilder] Prevent buttons names from starting with a capital letter #34445
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Ping @xabbuh.
It was forbidden in #28969 but it does not throw in 5.0 as it should.
We cannot use
FormConfigBuilder::validateName()
inButtonBuilder
because this one allows first capital letters. We cannot change it because form names can start with capital letters (it is currently not deprecated in 4.4).So we either also deprecate this (but why?) or we just validate button names in its own builder (proposed change in this PR).