Improve provider integration tests

[danielrbradley]

• Tidy up function naming.
• Make baseline version an argument.
• Use attachment & extract setup method.

[github-actions]

Does the PR have any schema changes?

Looking good! No breaking changes found.
No new resources/functions.

Maintainer note: consult the runbook for dealing with any breaking changes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 25.00%. Comparing base (fdabfa4) to head (f6d59ca).

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1678       +/-   ##
===========================================
+ Coverage    0.00%   25.00%   +25.00%     
===========================================
  Files           3        3               
  Lines           8        8               
===========================================
+ Hits            0        2        +2     
+ Misses          8        6        -2     

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