Allow tables to be excluded from backup if any incoming foreign key constraints have also been excluded from backup

I want to exclude a table from a backup, but I cannot if there's another table with an incoming foreign key dependency:

```
ALTER TABLE userfiles_root_upload_files SET (exclude_data_from_backup = true);
ERROR: cannot set data in a table with inbound foreign key constraints to be excluded from backup
```

However, if I also exclude the other table, I still cannot exclude the original table:

```
root@localhost:26257/defaultdb> ALTER TABLE userfiles_root_upload_payload SET (exclude_data_from_backup = true);
ALTER TABLE
root@localhost:26257/defaultdb> ALTER TABLE userfiles_root_upload_files SET (exclude_data_from_backup = true);
ERROR: cannot set data in a table with inbound foreign key constraints to be excluded from backup
```

**Describe the solution you'd like**
CockroachDB would run through the chain of FK constraints and only showing the above error message if it finds a dependency that isn't excluded.

Jira issue: CRDB-28473

Epic CRDB-61002