Add integration test for attention pruning

[danielkorzekwa]

What does this PR do?

Make score pruning activations self-contained (no dependency on internal Nvidia code) - 1/6

• add integration test for attention pruning (pre-step to make adding activation scoring safer)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.40%. Comparing base (866e400) to head (5dc5527).
⚠️ Report is 1 commits behind head on feature/compress.

Additional details and impacted files

@@                Coverage Diff                @@
##           feature/compress     #562   +/-   ##
=================================================
  Coverage             73.40%   73.40%           
=================================================
  Files                   180      180           
  Lines                 18127    18127           
=================================================
  Hits                  13306    13306           
  Misses                 4821     4821           

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