testutil/compose: fixed smoke dkg test

[pinebit]

SmokeTest/dkg was running by default with Teku VC, which caused a weird (yet unknown) error and the test to fail.
I verified all main commits for the past month trying to find where this was introduced and found that all the commits are failing reliably. I suspect this has something to do with docker engine update (I also updated mine locally and therefore could 100% reproduce the issue).
Even though we still don't know what was wrong with Teku in that specific test, in order to make our builds passing compose tests, I enabled Mock VC for this test, similar to what we do for other DKG tests in the same suite.

category: test
ticket: #2964

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.12%. Comparing base (66b41d7) to head (0419c31).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2965      +/-   ##
==========================================
+ Coverage   54.09%   54.12%   +0.03%     
==========================================
  Files         194      194              
  Lines       27402    27396       -6     
==========================================
+ Hits        14822    14827       +5     
+ Misses      10826    10816      -10     
+ Partials     1754     1753       -1     

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