Add mutation tools to chat workflow
## Problem <!-- Describe the underlying problem this issue is trying to solve --> Right now, the chat workflow cannot create/edit/write. We did this as a precaution, as well as to collaborate with UX on how best to showcase diffs. We want to be able to try these tools though in order to test them, so we should add them back in the chat workflow behind a feature flag for internal use only. We should also warn users that duo workflow can potentially overwrite any changes they've already made to their code. ## Desired Outcome <!-- In what way should the world be different if this issue is implemented. This does not need to specify a specific solution --> Chat workflow has access to mutation tools ## Implementation Plan <!-- How are we going to implement a solution to the problem. Can be TBD at the start of the issue. --> This work should be behind a feature flag
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