Chat: Fix "Ask Cody to Explain"

[umpox]

Description

• Pass the correct arguments to the cody.action.chat command
• Add type safety to avoid this mistake again

closes #2970

Test plan

1. Try "Ask Cody to Explain"
2. Check there is no error

[vadi2]

Is there an easy way to test this?

[umpox]

@vadi2 If you want to run this locally, you can checkout the branch locally and follow these docs: https://github.com/sourcegraph/cody/blob/main/doc/dev/index.md

I'll add some integration tests too :)

[vadi2]

% asdf install
Install plugins first to be able to install tools

Which plugins should I install?

[umpox]

@vadi2 Try this quickstart from the repo root:
pnpm install && pnpm build && cd vscode && pnpm run dev

That should work if you have NodeJS installed.

I've added an e2e test for this too

[vadi2]

No luck testing it - same issue in the 2nd vscode instance that pops up when I run the Launch VS Code Extension (Desktop) task, but it could be that I'm doing something wrong.

First time I launch it says:

Actual command not found, wanted to execute cody.action.chat /14

Any follow-up attempts yield this:

Cannot read properties of undefined (reading 'match')

[abeatrix]

Confirmed the Ask Cody to Explain works for me:

Also updated the failing e2e test that hopefully helps!

[umpox]

@vadi2 Might have been an issue with our local flow. We need to do a check on the instructions for first clones.

I've merged this now so will ensure this is included in the next release