[Bug] Cash Flow statement is not flipping signs appropriately.

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Describe the issue

The cash flow statement is looking at the account balances from the balance sheet and not flipping the signs on the appropriate accounts.

For example, an increase in Accounts Receivable month over month would be a negative impact to the Cash Flow statement, however it shows up as a positive impact.

Other accounts such as Accrued Revenue, Prepaid Expenses etc. would also need to be flipped accordingly.


### Relevant error log or model output

```shell
n.a
```

### Expected behavior

Cash Flow statement accounts should have the proper signs to help accurately calculate cash flows.

### dbt Project configurations

std.

### Package versions

std.

### What database are you using dbt with?

snowflake

### dbt Version

std.

### Additional Context

_No response_

### Are you willing to open a PR to help address this issue?

- [ ] Yes.
- [ ] Yes, but I will need assistance and will schedule time during our [office hours](https://calendly.com/fivetran-solutions-team/fivetran-solutions-team-office-hours) for guidance
- [ ] No.

Locate the dbt model that produces the Cash Flow statement and trace how it reads month-over-month balance-sheet account changes. Check the handling of Accounts Receivable, Accrued Revenue, and Prepaid Expenses first; done means the relevant cash-flow impacts use the correct signs and the statement calculates cash flows accurately.

Written by the indexing model from the issue text.