Before this commit, the BasicRelationModel, and thus the new form
view, still relied on the existence of legacy field Widgets for
their `specialData` and `fieldsToFetch` attributes. This commit
removes that dependency, s.t. we always look in the converted
Field component. To make this work, we needed to defined those
attributes on several Field components that need them:
`fieldsToFetch`: this was a mistake, it must be defined on new
Field components
`specialData`: the introduction of `legacySpecialData` is
temporary, until we stop using the BasicModel
closesodoo/odoo#101548
X-original-commit: d2a2fd94bfcef8360805b46a1692ba7eb84fbe1c
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>