Re-enable unauthed tests

[mkondratek]

closes https://linear.app/sourcegraph/issue/CODY-4546/fix-the-flaky-agentsrcunauthedteststs-and-reenabled-it-back

Test plan

green ci

[mkondratek]

I tried to regenerate the recordings. Locally I see the green status. However, there is this in the logs:

stderr | src/unauthed.test.ts > Initializing the agent without credentials > authenticates to same endpoint using valid credentials
----stderr----
[Polly] Recording may fail because the browser is offline.
{"url":"https://sourcegraph.com/.api/graphql?CurrentSiteCodyLlmConfiguration",
...

I couldn't find anything related to that offline browser. I am not sure what it means.
There are multiple errors like this.

@pkukielka, could you please checkout my branch and try to generate the recordings? I'd like to make sure it's not only my problem.