[OOC] Wire OOC Aggregate Unary and Bugfix Race Condition

[janniklinde]

This PR extends GroupedReduce primitive to different grouping formats. Further, this patch wires AggregateUnaryOOCInstruction to use those new primitives. This patch also provides a race condition fix for OOCCacheImpl.

Assisted-by: AI

[codecov]

Codecov Report

❌ Patch coverage is 57.89474% with 64 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.43%. Comparing base (9dccbc3) to head (5668ac5).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...instructions/ooc/AggregateUnaryOOCInstruction.java	42.02%	38 Missing and 2 partials ⚠️
...time/ooc/primitives/GroupedReduceOOCPrimitive.java	71.66%	11 Missing and 6 partials ⚠️
...g/apache/sysds/runtime/ooc/cache/OOCCacheImpl.java	63.15%	3 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2592      +/-   ##
============================================
- Coverage     71.44%   71.43%   -0.02%     
- Complexity    50437    50448      +11     
============================================
  Files          1629     1629              
  Lines        195513   195586      +73     
  Branches      38118    38129      +11     
============================================
+ Hits         139686   139708      +22     
- Misses        44867    44909      +42     
- Partials      10960    10969       +9     

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