New DELETE contacts flow for Sandbox & fixes for searchByPhoneNumber flow

[Aleksandr-v25]

Description:

1. We are missing IncompleteRecord field in the GET searchByPhoneNumber flow.

2. searchByPhoneNumber flow should support search based on all fields: Parent_Phone_01__c, Parent_Phone_02__c , Parent_Phone_03__c, not only the first one.

3. For development purposes, we need a flow that would allow us to delete contacts, but available only on Sandbox environment. This verification can be achieved by verifying what .env file is used to run the app.