feat: Filter out product positions from GetPersonnelAllocation

[aleklundeq]

• New feature
• Bug fix
• High impact

Description of work:
We don't want product positions (instances) to show up in the list over all allocations in Personnel Allocation, and therefore we need to filter out all these positions.

AB#55286
AB#53017

Testing:

• Can be tested
• Automatic tests created / updated
• Local tests are passing

Can be tested with using endpoint:
https://resources-api-pr-686.fusion-dev.net/departments/{departmentString}/resources/personnel/{personId}?api-version=1.0

Change departmentString with the department you want to check and change personId to a person you want to check. Example "PDP PRD PMC PCA PCA4".
There should be several persons with product positions assigned to them, but these should not be shown when searching for them here.

Should get all other positions for personnel.

Checklist:

• Considered automated tests
• Considered updating specification / documentation
• Considered work items
• Considered security
• Performed developer testing
• Checklist finalized / ready for review