Add functionality for editing Cody messages

[SuperAuguste]

Closes #50974

Test plan

Tested locally in VSCode and it seems to work - feel free to suggest additional testing methodologies :)

[sg-e2e-regression-test-bob]

Bundle size report 📦

Initial size	Total size	Async size	Modules
0.00% (0.00 kb)	0.01% (+2.12 kb)	0.02% (+2.12 kb)	0.00% (0)

Look at the Statoscope report for a full comparison between the commits dfb023d and afc1b03 or learn more.

Note: We do not have exact data for 52a6cc3. So we have used data from: afc1b03.
The intended commit has no frontend pipeline, so we chose the last commit with one before it.

Open explanation

• Initial size is the size of the initial bundle (the one that is loaded when you open the page)
• Total size is the size of the initial bundle + all the async loaded chunks
• Async size is the size of all the async loaded chunks
• Modules is the number of modules in the initial bundle

[abeatrix]

This is really really cool! So cool I went over a bit on the review so please let me know if my suggestions don't make sense 😆
Most of them are just nits, except the new changes allow users to replace with an empty input so requesting a change on that 🙇‍♀️

[mrnugget]

I pushed two commits that should help with the ESLint errors

[abeatrix]

Nice! The update works great on my local vscode instance 👍

[mrnugget]

@SuperAuguste I'm gonna go ahead and merge this. Thanks!