[Feature] Behavior change for updating cumulative type param fields

[DevonFulcher]

Is this your first time submitting a feature request?

• I have read the expectations for open source contributors
• I have searched the existing issues, and I could not find an existing issue for this feature
• I am requesting a straightforward extension of existing dbt functionality, rather than a Big Idea better suited to a discussion

Describe the feature

The location of cumulative type param fields has moved, so there should be a behavior change to indicate that the old yaml spec has been deprecated.

Describe alternatives you've considered

No response

Who will this benefit?

This will benefit MetricFlow users.

Are you interested in contributing this feature?

Yes

Anything else?

No response