Rename 'trias' sandbox to 'ojp'

[leonardehrenfried]

Summary

It renames the package name of the trias sandbox to ojp. This is a preparation for the addition of the real OJP API further down the line.

Issue

Ref #2753

Unit tests

No.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.17%. Comparing base (18358ac) to head (ba6eb88).
⚠️ Report is 5 commits behind head on dev-2.x.

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #7166      +/-   ##
=============================================
- Coverage      72.17%   72.17%   -0.01%     
+ Complexity     20878    20876       -2     
=============================================
  Files           2273     2273              
  Lines          84437    84437              
  Branches        8424     8424              
=============================================
- Hits           60943    60941       -2     
- Misses         20519    20520       +1     
- Partials        2975     2976       +1     

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