Sweep: Update Butterfish with `fish` shell compatibility (✓ Sandbox Passed)

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  Description

  This pull request updates Butterfish with compatibility for the fish shell. It modifies the SetPS1 function in shell.go to include a new case for the fish shell, which sets the fish_prompt variable with the appropriate escape sequences to prevent counting enclosed characters when calculating the cursor position.

Summary

• Modified shell.go:
  • Added a new case for the fish shell in the SetPS1 function.
  • Updated the ps1 variable to include the necessary escape sequences for the fish shell.
  • Added a log message for unsupported shells, providing a link to file an issue on GitHub.

Fixes #3.

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• [X] Running GitHub Actions for butterfish/shell.go ✓

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Rollback Files For Sweep

• [ ] Rollback changes to False
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Apply Sweep Rules to your PR?

• [ ] Apply: All new business logic should have corresponding unit tests.
• [ ] Apply: Refactor large functions to be more modular.
• [ ] Apply: Add docstrings to all functions and file headers.