[tidy first] move exception import to top of functions.py

[MichelleArk]

resolves #N/A

Description

The necessity to import this exception dynamically was caused by circular dependencies which have been untangled as part of dbt-labs/dbt-core#8917. This should no longer cause a circular dependency!

Checklist

• I have read the contributing guide and understand what's expected of me
• I have signed the CLA
• I have run this code in development and it appears to resolve the stated issue
• I have opened an issue to add/update docs, or docs changes are not required/relevant for this PR
• I have run changie new to create a changelog entry

[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the contributing guide.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.26%. Comparing base (87a7cc5) to head (d6255df).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #115   +/-   ##
=======================================
  Coverage   56.26%   56.26%           
=======================================
  Files          50       50           
  Lines        3082     3082           
=======================================
  Hits         1734     1734           
  Misses       1348     1348           

Flag	Coverage Δ
unit	56.26% <100.00%> (ø)

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