Deposit front-running checks before staking to validators

[naddison36]

Changes

• Added snapValidators Hardhat task
• Added third staking strategy to Defender Actions
• Added check for deposit front-running in Defender Action that does the staking
• Updated OETH contracts diagram
• Fix native staking fork tests when there are a lot of consensus rewards in the strategy

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.19%. Comparing base (adf36d1) to head (ae2e4d7).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2311      +/-   ##
==========================================
- Coverage   53.26%   52.19%   -1.08%     
==========================================
  Files          79       79              
  Lines        4098     4098              
  Branches     1079     1079              
==========================================
- Hits         2183     2139      -44     
- Misses       1912     1956      +44     
  Partials        3        3              

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