[LINST] skip metadatafields for surveys

[zaliqarosli]

Brief summary of changes

replacing #8863

Skip over metadatafields and calculate ages in surveys

This is not a big change, one way or another the fields were either being skipped with an empty check, through a project override or through code in the module itself handling the submission. this is just an explicit check to make everything clearer

• Have you updated related documentation?

Testing instructions (if applicable)

Link(s) to related issue(s)

• Resolves # (Reference the issue this fixes, if any.)