chore: use clamped multiply

[petreze]

Description:
Harden and clamp staking reward multiplication at end of staking period

Related issue(s):

Fixes #

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[lfdt-bot]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff            @@
##               main   #27018   +/-   ##
=========================================
  Coverage     70.55%   70.55%           
- Complexity    11692    11693    +1     
=========================================
  Files          2586     2586           
  Lines        108553   108554    +1     
  Branches      12166    12166           
=========================================
+ Hits          76586    76593    +7     
+ Misses        27970    27964    -6     
  Partials       3997     3997           

Files with missing lines	Coverage Δ	Complexity Δ
...pl/handlers/staking/EndOfStakingPeriodUpdater.java	94.94% <100.00%> (+0.05%)	12.00 <0.00> (ø)
...impl/handlers/staking/EndOfStakingPeriodUtils.java	100.00% <100.00%> (ø)	18.00 <0.00> (ø)

... and 2 files with indirect coverage changes

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[testlens-app]

✅ All tests passed ✅

🏷️ Commit: a02f433
▶️ Tests: 21860 executed
⚪️ Checks: 47/47 completed

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