test: delegate_increase_delegate_flow_test

[noa-starkware]

Note

Adds a test for delegation-then-increase-delegation reward flow and removes a duplicate item from flow ideas.

• Tests:
  • Add delegate_increase_delegate_flow_test in src/flow_test/test.cairo to validate rewards when a delegator increases delegation across epochs and attestations.
• Docs:
  • Remove duplicate flow idea from src/flow_test/flow_ideas.md.

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This change is 

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.71%. Comparing base (ca1738b) to head (47dcdf1).
⚠️ Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #85      +/-   ##
==========================================
+ Coverage   95.69%   95.71%   +0.01%     
==========================================
  Files          42       42              
  Lines        9930     9959      +29     
==========================================
+ Hits         9503     9532      +29     
  Misses        427      427              

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[NirLevi-starkware]

@NirLevi-starkware reviewed 2 of 2 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @noa-starkware)