Enable consensus tests under thread sanitizer

[yperbasis]

Previously they were killed probably due to out of memory, so I reduced the number of threads to 4 (xlarge resource_class in CircleCI has 8 CPUs).

[codecov]

Codecov Report

Merging #607 (dd8c6cd) into master (47b7a79) will decrease coverage by 0.06%.
The diff coverage is n/a.

❗ Current head dd8c6cd differs from pull request most recent head d0a909c. Consider uploading reports for the commit d0a909c to get more accurate results

@@            Coverage Diff             @@
##           master     #607      +/-   ##
==========================================
- Coverage   81.81%   81.74%   -0.07%     
==========================================
  Files         169      169              
  Lines       13949    13949              
==========================================
- Hits        11412    11403       -9     
- Misses       2537     2546       +9     

Impacted Files	Coverage Δ
core/silkworm/state/intra_block_state.cpp	96.51% <0.00%> (-0.95%)	⬇️
core/silkworm/execution/evm.cpp	96.08% <0.00%> (-0.83%)	⬇️
core/silkworm/crypto/sha-256.c	51.24% <0.00%> (-0.50%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 47b7a79...d0a909c. Read the comment docs.