Validator balance checks before deposit

[naddison36]

Changes

• Added snapValidators Hardhat task
• Added third staking strategy to Defender Actions
• Added check that validators do not exist before staking deposit in Defender Action
• Updated OETH contracts diagram

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 53.36%. Comparing base (4f1de43) to head (2d0066d).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2311   +/-   ##
=======================================
  Coverage   53.36%   53.36%           
=======================================
  Files          79       79           
  Lines        4098     4098           
  Branches     1079     1079           
=======================================
  Hits         2187     2187           
  Misses       1908     1908           
  Partials        3        3           

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