Restore random seed functionality

[axlewin]

Only add the new tie-break sort order clauses if there is no random seed set, otherwise it should be null (as before).

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 40.97%. Comparing base (7ed07b2) to head (e85e551).

Files with missing lines	Patch %	Lines
...am/cl/dtg/segue/dao/content/GitContentManager.java	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #814   +/-   ##
=======================================
  Coverage   40.97%   40.97%           
=======================================
  Files         550      550           
  Lines       23552    23555    +3     
  Branches     2836     2837    +1     
=======================================
+ Hits         9650     9652    +2     
  Misses      13032    13032           
- Partials      870      871    +1     

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[barna-isaac]

Looks good, thanks for the fix.