[ntuple] fix merging of pre-ROOT-6.36 NTuples#22433
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Pre-ROOT-6.36 RNTuples (spec 1.0.0.0) stored field type names using ROOT Meta normalization (e.g. "Float_t" for float) instead of canonical C++ names. The merger rejected such files when merging with current-spec NTuples because it compared type names as raw strings. Reading back merged outputs derived from such files also failed in ReconcileFloatingPointField() for the same reason. Closes root-project#22130
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Pre-ROOT-6.36 RNTuples (spec 1.0.0.0) stored field type names using ROOT Meta normalization (e.g.
Float_tforfloat) instead of canonical C++ names. This caused merging such files with current-spec NTuples to fail. Even after a successful merge, reading back the output would also fail for the same reason.Closes #22130