Add support for external contexts in ML-DSA ACVP

[samuel40791765]

cherry picked from commit on main: 7c02cb3

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.69%. Comparing base (613f0fd) to head (fa24505).
⚠️ Report is 1 commits behind head on fips-2025-09-12.

Additional details and impacted files

@@               Coverage Diff                @@
##           fips-2025-09-12    #2881   +/-   ##
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  Coverage            78.69%   78.69%           
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  Files                  667      667           
  Lines               113027   113027           
  Branches             16068    16069    +1     
================================================
  Hits                 88948    88948           
  Misses               23305    23305           
  Partials               774      774           

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