Intercept Ollama errors before Webview, to display Download/Start options

[fbricon]

Fixes #3674

Description

Ollama specific errors are intercepted in VS Code's webviewProtocol class, before they're propagated to the webview, so they can be treated the same way as in #3653, and allow users to start or download Ollama if needed.

Checklist

• The relevant docs, if any, have been updated or created
• The relevant tests, if any, have been updated or created

Screenshots

Before:

or, when #3725 is applied:

After:

Testing instructions

• define an ollama model for chat
• stop the ollama service
• trying chatting

[netlify]

✅ Deploy Preview for continuedev canceled.

Name	Link
🔨 Latest commit	d9a1c05
🔍 Latest deploy log	https://app.netlify.com/sites/continuedev/deploys/67a27c3e8296180008c4b013

[fbricon]

I decided to remove the Documentation option shown during completion failure, when ollama is not started:

• so both chat and completion failures show the consistent messages
• the documentation link is irrelevant when ollama is stopped

[fbricon]

so actually this PR is based on top of #3725, leveraging the change in the respond signature (now allowing type any) https://github.com/continuedev/continue/pull/3725/files#diff-d513811389b8716365ea98f8def6c27c9a3ad66fab169690aeb5f67a40497a2dR58

So do not merge this before #3725, or else there will be a compilation error.