test: staker multiple pools flow test

[noa-starkware]

Note

Adds an end-to-end test covering rewards distribution for a staker with STRK and BTC pools and multiple delegators; removes corresponding ideas from flow_ideas.md.

• Tests:
  • Add staker_multiple_pools_multiple_delegators_flow_test in src/flow_test/test.cairo validating rewards across epochs for a staker with STRK and BTC pools and two delegators per pool, covering stake increases, delegation enters/increases/exit intents, attestations, and final claims (with rounding tolerances).
• Docs/Ideas:
  • Remove two covered ideas from src/flow_test/flow_ideas.md under k=1 -> k=2 balances.

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This change is 

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.69%. Comparing base (7192a42) to head (01b9979).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
+ Coverage   95.64%   95.69%   +0.05%     
==========================================
  Files          42       42              
  Lines        9794     9930     +136     
==========================================
+ Hits         9367     9503     +136     
  Misses        427      427              

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[NirLevi-starkware]

@NirLevi-starkware reviewed 2 of 2 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @noa-starkware)

[NirLevi-starkware]

@NirLevi-starkware reviewed 2 of 2 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @noa-starkware)