New DELETE contacts flow for Sandbox & fixes for GET searchByPhoneNumber flow

[a-v25]

1. Add missing IncompleteRecord field in the GET searchByPhoneNumber flow.
2. Add search based on Parent_Phone_02__c and Parent_Phone_03__c to searchByPhoneNumber flow
3. Add DELETE Contact flow enabled only on Sandbox

• If 'production' env is detected, throw 405 error:

• If contact not found, return 404 error:

• If contact is found and successfully deleted, return 200