refactor: change leaf data name to leaf

[AvivYossef-starkware]

This change is 

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.65%. Comparing base (94d0be9) to head (c308bdf).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #306   +/-   ##
=======================================
  Coverage   70.65%   70.65%           
=======================================
  Files          38       38           
  Lines        2082     2082           
  Branches     2082     2082           
=======================================
  Hits         1471     1471           
  Misses        541      541           
  Partials       70       70           

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[dorimedini-starkware]

Reviewed 12 of 12 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @AvivYossef-starkware)

[github-actions]

Benchmark movements:
tree_computation_flow performance improved 😺
tree_computation_flow time: [34.269 ms 34.352 ms 34.441 ms]
change: [-4.4847% -3.0192% -1.7313%] (p = 0.00 < 0.05)
Performance has improved.
Found 2 outliers among 100 measurements (2.00%)
2 (2.00%) high mild