[PIN-6420] Validate Head column in import (!2043) · Merge requests · humansis / Web platform / backend

Due to missing validation of head column it was possible to have first row in import file as member (head was set to false). This will add validation that row which is representing household has to be head and other columns has to be member.

Closes PIN-6420

[PIN-6420] Validate Head column in import

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