[extension/opamp]: Support auth extensions

[BinaryFissionGames]

Component(s)

extension/opamp

Describe the issue you're reporting

Like #32762 but for the extension, we need to support using auth extensions with the opamp extension.

We can currently implement a hacky version, and transition to a more robust solution later when we are able to implement websocket support in the upstream auth package.

[github-actions]

Pinging code owners:

• extension/opamp: @portertech @evan-bradley @tigrannajaryan @BinaryFissionGames

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[crobert-1]

Removing needs triage as this was filed by a code owner and makes sense to me.