Update `ConfluentCloudAuthProvider`'s event listener patterns for consistency

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#2,734 opened on Sep 30, 2025 0 comments 0 reactions 1 assignee Claimed by @shouples View on GitHub

cleanup

Description

https://github.com/confluentinc/vscode/pull/2713#discussion_r2391891536

Need to set standalone handler functions for:
- `secretsOnDidChangeSub`
- `ccloudAuthCallbackSub`
- `ccloudAuthSessionInvalidatedSub`

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