Make OUSD EIP-7702 compatible and simplify yield delegation process.

[clement-ux]

Description

Main point

Due to EIP-7702, some EOAs can be reported as smart contracts when using the _account.code.length > 0 check.
This PR aims to fix this and enable EIP-7702 users to use OUSD like other “traditional” EOAs.

Sources:

• https://eip7702.io/
• https://viem.sh/docs/eip7702

Secondary Point

After multiple months of experience, managing delegateYield() and undelegateYield() through governance has turned out to be a pain point. This PR aims to reduce that friction by allowing the strategist to call these two functions.
This does not reduce security, as the only potential impact of a rogue strategist would be causing a user to lose yield.

• Simplify yield delegation process. #2544

Notion project:

• Notion

Code Change Checklist

To be completed before internal review begins:

• The contract code is complete
• Executable deployment file
• Fork tests that test after the deployment file runs
• Unit tests *if needed
• The owner has done a full checklist review of the code + tests

Internal review:

• Two approvals by internal reviewers

[github-actions]

	Warnings
⚠️	👀 This PR needs at least 2 reviewers

Generated by 🚫 dangerJS against 6b8c58c

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.18%. Comparing base (d8af1ee) to head (6b8c58c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2543   +/-   ##
=======================================
  Coverage   41.18%   41.18%           
=======================================
  Files         106      106           
  Lines        4956     4956           
  Branches     1302     1302           
=======================================
  Hits         2041     2041           
  Misses       2913     2913           
  Partials        2        2           

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