[WIP][Form] Improve transformation failure message by providing property path
feature #11318 [WIP][Form] Improve transformation failure message by providing property path (jubianchi)

This PR was squashed before being merged into the 2.6-dev branch (closes #11318).

Discussion
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[WIP][Form] Improve transformation failure message by providing property path

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   |
| Fixed tickets | #11287
| License       | MIT
| Doc PR        |

Commits
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d56b7be [WIP][Form] Improve transformation failure message by providing property path