## Description

All references to these fields have been removed from readers, so we can
stop keeping it up-to-date. Once this change lands, we can also clean
these tables from the schema.

## Test plan

```
sui$ cargo nextest run -p sui-indexer
```

## Stack

- #19708 
- #19802 
- #19803 
- #19804 
- #19805 

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## Release notes

Check each box that your changes affect. If none of the boxes relate to
your changes, release notes aren't required.

For each box you select, include information after the relevant heading
that describes the impact of your changes that a user might notice and
any actions they must take to implement updates.

- [ ] Protocol: 
- [ ] Nodes (Validators and Full nodes): 
- [x] Indexer: Indexer no longer fills the `tx_sender` and
`tx_recipient` tables.
- [ ] JSON-RPC: 
- [ ] GraphQL: 
- [ ] CLI: 
- [ ] Rust SDK:
- [ ] REST API: