Support DuckDB percentile medians

[YahiaQuacks]

Please provide your name and company

Yahia Mostafa, MotherDuck.

Link the issue/feature request which this PR is meant to address

No public issue yet. This addresses a DuckDB compatibility issue in the Jira package’s median metric models.

Detail what changes this PR introduces and how this addresses the issue/feature request linked above.

This PR updates the Jira median metric models so DuckDB uses the grouped aggregate percentile path already used by Postgres. Depends on fivetran/dbt_fivetran_utils#155, which adds the DuckDB dispatch for fivetran_utils.percentile.

DuckDB supports percentile_cont(...) within group (order by ...) as an aggregate, but does not support the Redshift-style percentile_cont(...) within group (...) over (...) window form emitted through the default fivetran_utils.percentile dispatch.

This PR:

• Adds DuckDB to the grouped median CTE condition in user metrics.
• Adds DuckDB to the grouped median CTE condition in project metrics.
• Updates the fivetran_utils dependency floor to a version that includes duckdb__percentile.
• Updates changelog, package versions, and dependency documentation.

How did you validate the changes introduced within this PR?

Validated against DuckDB:

• Aggregate form succeeds: percentile_cont(0.5) within group (order by x).
• Windowed ordered-set form fails with Catalog Error: Aggregate Function with name percentile_cont does not exist!, matching the reported failure.
• A grouped Jira-style median query returns expected per-user medians.

Also ran git diff --check.

Which warehouse did you use to develop these changes?

DuckDB/MotherDuck.

Did you update the CHANGELOG?

• Yes

Did you update the dbt_project.yml files with the version upgrade (please leverage standard semantic versioning)? (In both your main project and integration_tests)

• Yes

Typically there are additional maintenance changes required before this will be ready for an upcoming release. Are you comfortable with the Fivetran team making a few commits directly to your branch?

• Yes
• No

If you had to summarize this PR in an emoji, which would it be?

🦆