Staking and CCIP transition to USDC

[kirilaa]

Transition from sUSD/USDbC -> USDC
Steps:

1. Upgrade Staking contract (add setFeeToken(address newFeeToken) function)
2. Pause StakingThales
3. Set new feeToken (USDC) using setFeeToken(USDC_address) on StakingThales
4. Set new feeToken (USDC) using setSUSD(USDC_address)on SafeBoxBuffer
5. Withdraw old feeToken (sUSD/USDCb) from StakingThales
6. (Swap &) Send equal amount of new collateral to StakingThales
7. Send funds of new collateral to SafeBoxBuffer
8. Batch transactions:
   • unpause StakingThales
   • closePeriod() on StakingThales

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.90%. Comparing base (7f33f88) to head (17f5c8b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #488      +/-   ##
==========================================
+ Coverage   83.68%   83.90%   +0.22%     
==========================================
  Files         117      117              
  Lines        3683     3685       +2     
  Branches     1924     1925       +1     
==========================================
+ Hits         3082     3092      +10     
+ Misses        601      593       -8     

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