Use reputer nonce as latestAvailable

[xmariachi]

Purpose of Changes and their Description

GetLatestAvailableNetworkInferences currently gets the latest inferences in allInferences but doesn't check if there are losses set for that particular nonce (it does check if there is some reputer nonce set in the past though)
This PR changes it to get the network inferences from the latest reputer token, which changes the Available concept to those having had reputation.
Not sure if this is the expected behaviour, so leaving impl as Draft with a test that is not yet working, will fix when we align here.

Link(s) to Ticket(s) or Issue(s) resolved by this PR

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• If documented, please describe where. If not, describe why docs are not needed.
• Added to Unreleased section of CHANGELOG.md?

Still Left Todo

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