Add deployment file to remove Balancer rETH strategy

[shahthepro]

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

Deploy checklist

Two reviewers complete the following checklist:

- [ ] All deployed contracts are listed in the deploy PR's description
- [ ] Deployed contract's verified code (and all dependencies) match the code in master
- [ ] The transactions that interacted with the newly deployed contract match the deploy script.
- [ ] Governance proposal matches the deploy script
- [ ] Smoke tests pass after fork test execution of the governance proposal

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 59.66%. Comparing base (0535236) to head (f9e7192).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2096 +/- ## ========================================== - Coverage 61.86% 59.66% -2.20% ========================================== Files 66 66 Lines 3322 3322 Branches 863 863 ========================================== - Hits 2055 1982 -73 - Misses 1264 1337 +73 Partials 3 3 ```

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