Allow for customization of the environment in which test fixtures are…

[peterallenwebb]

Problem

Tests are failing due to changes in the way environment is managed by dbt.

Solution

Allow the environment to be modified by tests so that they can affect the way fixtures are processed.

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX
• This PR includes type annotations for new and modified functions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.08%. Comparing base (a1f0057) to head (b1262c1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9894      +/-   ##
==========================================
- Coverage   88.15%   88.08%   -0.08%     
==========================================
  Files         178      178              
  Lines       22455    22459       +4     
==========================================
- Hits        19796    19782      -14     
- Misses       2659     2677      +18     

Flag	Coverage Δ
integration	85.44% <100.00%> (-0.16%)	⬇️
unit	61.87% <66.66%> (+<0.01%)	⬆️

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[QMalcolm]

This looks great! Let's get it merged