Deploy a Fixed Rate Dripper for OETH.

[clement-ux]

This PR aims to:

• Add a new function to the current Dripper.sol contract, that allows the governor to transfer all tokens sitting in the Dripper to a specified address.
• Deploy this new implementation and upgrade the current Dripper contract on OETH.
• Deploy a new proxy + implementation for a Fixed Rate Dripper (no new code).
• Transfer all remaining WETH from the current Dripper to the new one.
• Set the new dripper address on the vault.

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 d6e4165

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.28%. Comparing base (c77fe36) to head (d6e4165).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2350      +/-   ##
==========================================
- Coverage   53.62%   53.28%   -0.34%     
==========================================
  Files          82       83       +1     
  Lines        4196     4200       +4     
  Branches     1101     1102       +1     
==========================================
- Hits         2250     2238      -12     
- Misses       1943     1959      +16     
  Partials        3        3              

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[clement-ux]

Closed as duplicated with deployment PR: #2351