CDB3-4257 Add validation on required documents while patching award to active status

STR:
1.Create procedure
2.Upload ONE of the documents - auctionProtocol, contractSigned
3.Patch award to active status

AR:
award status is active
https://procedure-dev.prozorro.sale/api/procedures/643fe351b8a44ad310db2ad5
https://procedure-dev.prozorro.sale/api/procedures/643fe390b8a44ad310db2ad9

ER:
Both documents - auctionProtocol and contractSigned are required for patching award to active status