triage(Keys_Incoming): Investigate key rotation

[LHerskind]

With key rotation of the incoming key we need to have a more flexible method of decrypting messages that are of interest to use.

As it is not yet fully clear how much is really broken by rotating keys, we need to triage it first. I expect that performing a key-rotation during the token tests is likely to show os most of the issues that we will encounter.

I think the note processor is the main place where we need additional logic to address multiple keys, but it is not clear to me yet.

Please investigate what is broken by rotating, and create issues in here as more is encountered.

Look for "TODO(#6531)" in the codebase.

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1. refactor(Keys_Incoming): Update note processor for key rotation

[benesjan]

Outdated issue now so I am closing it