fix: datadiff week inconsistency between SQL Server and Snowflake (DNA-17332 / DNA-19251)

[Dennis-UiPath]

Description

• The output for datediff using week as datepart is not the same for SQL Server and Snowflake. The difference is caused because Snowflake and SQL Server use a different day as start of the week, for Snowflake this is Monday, for SQL Server this is Sunday. This fix aligns both (week starting on Monday).

Release

• Direct release (main)
• Merge to dev (or other) branch
  • Why:

Did you consider?

• Does it Work on Automation Suite / SQL Server
• Does it Work on Automation Cloud / Snowflake
  - [ ] What is the performance impact?
• The version number in dbt_project.yml
  • We will release this together with the next update for pm_utils

[silviustanimir]

This is a setting for both SQL Server and Snowflake.
Indeed they have different default, but I'm wondering whether we should actually apply this change or just refer into our documentation that this difference may exist.

[Dennis-UiPath]

This is a setting for both SQL Server and Snowflake. Indeed they have different default, but I'm wondering whether we should actually apply this change or just refer into our documentation that this difference may exist.

For SQL Server the datediff_big function does not use the setting to make it deterministic: https://learn.microsoft.com/en-us/sql/t-sql/functions/datediff-big-transact-sql?view=sql-server-ver16#remarks