skip websocket auth init if initialized

[avalanche123]

Description of your changes

During websocket initialization we overwrote auth context populated from the
request middleware. This is necessary when using the playground as browsers
send only a limited subset of headers when initializing a websocket connection.
However, for programmatic websocket clients that do send auth headers in the
initial upgrade request, the websocket init function was clearing those from
context.

This PR makes auth context initialization from the websocket connection init
function conditional and only runs if auth context wasn't already initialized.

I have:

• Read and followed Upbound's contribution process.
• Run make reviewable to ensure this PR is ready for review.
• Added backport release-x.y labels to auto-backport this PR, as appropriate.

How has this code been tested

I'm testing this locally with a programmatic websocket client.

[darkmuggle]

That's a lot of ||'s

LGTM