Update Cody extension name for SEO

[chillatom]

See link for context

Update extension marketplace name and description

[kalanchan]

@toolmantim to follow up with @chillatom on implications of changing the name in other areas of the product

[toolmantim]

I can see that Tabnine do this too for the name:

As far as UI footprint implications of this change, I gave it a test on a branch and it does make our VS Code notifications spammy:

I personally think this change looks gross, and Tabnine is often quoted by @sqs as an anti-example of what we want to do. e.g. in the status bar we used "Sign In" instead of "Sign in to use Cody", which is a much more subtle change than this.

I can see an argument for trying to temporarily to see if we do get heaps more traffic from the VS Code marketplace. But unless this is going to have a huge impact, and I'd strongly suggest we don't do it.

[abeatrix]

Discussion in https://sourcegraph.slack.com/archives/C05AGQYD528/p1713890318359469