Sonic Staking Strategy handling when a validator is fully slashed

[naddison36]

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 efe2fa2

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.65%. Comparing base (7f84aaa) to head (efe2fa2).
Report is 5 commits behind head on nicka/sonic-staking-oz-audit.

Additional details and impacted files

@@                       Coverage Diff                        @@
##           nicka/sonic-staking-oz-audit    #2413      +/-   ##
================================================================
+ Coverage                         49.43%   51.65%   +2.21%     
================================================================
  Files                                94       94              
  Lines                              4717     4724       +7     
  Branches                           1251     1252       +1     
================================================================
+ Hits                               2332     2440     +108     
+ Misses                             2381     2280     -101     
  Partials                              4        4              

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