retire indirect send feature for tips

### Description

https://gitcoincore.slack.com/archives/CRCSVFHD1/p1636149157069400?thread_ts=1634550926.079200&cid=CRCSVFHD1

There are a bunch of problems with the gas + transferability of tips when they are indirectly sent.

We would like to retire the /tips flow where the user can still indirectly send tips to a party that does not have a preferred_payment_address set.

Instead, the sending user should be told they cannot send until the receiving user has set their preferred payout address.

### Acceptance Criteria
GIVEN I am sending a tip to a user who has a preferred payment address set
WHEN I try to send the tip
THEN the action is successful.

GIVEN I am sending a tip to a user who does not have a preferred payment address set
WHEN I try to send the tip
THEN I see an error message informing me that I cannot send the tip to a receiving user that has not set their preferred payment address.