Plumb padding parameters to breakdown_reveal_aggregation

[andyleiserson]

Use the relaxed parameters for most tests, and disable padding for the end-to-end malicious test when running under shuttle.

I believe this will resolve the newer failure symptom in #1312.

[codecov]

Codecov Report

Attention: Patch coverage is 96.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 93.52%. Comparing base (a55a3b4) to head (c8a0281).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
ipa-core/src/protocol/ipa_prf/mod.rs	83.33%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1331   +/-   ##
=======================================
  Coverage   93.52%   93.52%           
=======================================
  Files         208      208           
  Lines       33872    33891   +19     
=======================================
+ Hits        31679    31697   +18     
- Misses       2193     2194    +1     

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