[BI-2755] - improve default sub-unit sort

[HMS17]

Description

Story: BI-2755 - improve default sub-unit sort

Removed default UI sorting of experimental dataset as it is handled in backend instead.

Dependencies

bi-api: BI-2755

Testing

Check there is no table column sort arrow by default when loading a dataset

Checklist:

• I have performed a self-review of my own code
• I have tested my code and ensured it meets the acceptance criteria of the story
• I have create/modified unit tests to cover this change
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to documentation
• I have run TAF: <link to TAF run>
• I have run SiteImprove on pages impacted by changes