Remove unused document types

[Sepehr-Sobhani]

Describe the task

In the early days of Reg1, we added various document types as production data in 0002_prod_data.py. Currently, many of these document types are not in use. At the time of creating this ticket, we are not utilizing the following document types:

DocumentType(name='proof_of_authority_of_partner_company'),
DocumentType(name='senior_officer_proof_of_authority'),
DocumentType(name='operation_representative_proof_of_authority'),
DocumentType(name='soce_senior_officer_proof_of_authority'),
DocumentType(name='proof_of_start'),
DocumentType(name='opt_in_signed_statutory_declaration')

Acceptance Criteria

• Create a migration in the registration app and remove unused document types

Additional context

• Add any other context about the task here.
• Or here

[patriciarussellCAS]

@Sepehr-Sobhani will we still need to do this after we've moved to Reg 2? Or will these be removed as part of the migration?

[Sepehr-Sobhani]

This task can be done at any time; it's just a database cleanup.