[Feature] Leverage macro to ensure no fan outs

### Is there an existing feature request for this?

- [X] I have searched the existing issues

### Describe the Feature

With the removal of the `dbt_expectations.expect_table_row_count_to_equal_other_table` in PR #66 , we'll need to come up with an in house macro that will check that the metafield mondels have the same row count as the staging models.

### Describe alternatives you've considered

_No response_

### Are you interested in contributing this feature?

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

### Anything else?

_No response_