feat(server): Separate auth related webhooks into their own log context

[nalanj]

Isolates webhook logs for auth token refresh failure and connection creation and gives those webhook logs new types

See https://linear.app/nango/issue/NAN-1547/log-nango-webhooks

How I tested it:

• Make sure webhooks are configured and enabled locally
• Break an integration and trigger a token refresh to see a failed refresh webhook
• Create a new connection to see a new connection

[TBonnin]

a lot of data passthrough just to create a log context 🙊

[nalanj]

@TBonnin This made me very sad as I did it.

[bodinsamuel]

👌🏻