Reduce number of parallel executions when running tests with valgrind

[alonre24]

No description provided.

[codecov]

Codecov Report

Merging #820 (6cea688) into master (0000228) will increase coverage by 5.84%.
The diff coverage is 80.53%.

@@            Coverage Diff             @@
##           master     #820      +/-   ##
==========================================
+ Coverage   74.11%   79.96%   +5.84%     
==========================================
  Files          39       53      +14     
  Lines        6081     8019    +1938     
==========================================
+ Hits         4507     6412    +1905     
- Misses       1574     1607      +33     

Impacted Files	Coverage Δ
src/redis_ai_types/model_type.c	70.00% <ø> (ø)
src/redis_ai_types/script_type.c	70.00% <ø> (+5.00%)	⬆️
src/redis_ai_types/tensor_type.c	73.33% <ø> (ø)
src/serialization/AOF/rai_aof_rewrite.c	0.00% <0.00%> (ø)
tests/module/DAG_utils.c	88.23% <ø> (ø)
tests/module/LLAPI.c	74.46% <ø> (ø)
tests/unit/rmalloc.h	100.00% <ø> (ø)
tests/unit/unit_tests_err.cpp	100.00% <ø> (ø)
.../serialization/RDB/decoder/previous/v2/decode_v2.c	36.74% <36.74%> (ø)
src/backends/libtflite_c/tflite_c.cpp	58.16% <46.00%> (ø)
... and 79 more

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