Remove subnet filter from Peer.TrackedSubnets()

[StephenButtolph]

Why this should be merged

For Sov networking, we must track which subnets the peer is attempting to connect to. Rather than including this information in every GetPeerList message, we can use the information provided during the Handshake. However, currently we limit the memory usage of a peer by filtering the provided subnets to be the subset of subnets that the local node also tracks.

This PR removes the filtering of tracked subnets and replaces it with a maximum number of tracked subnets.

How this works

• Removes if p.MySubnets.Contains(subnetID) { from the handling of subnetIDs in the Handshake message.
• Updates the usage of trackedSubnets to filter with the local trackedSubnets (if needed).

How this was tested

• Added unit test
• CI
• Running on Fuji seems to report non-tracked subnets from info.Peers now.

{
    "ip": "54.163.96.167:9651",
    "publicIP": "54.163.96.167:9651",
    "nodeID": "NodeID-GPc1Si7SQ6oAEfP8MzQ3cFN3fsAtkwC6i",
    "version": "avalanchego/1.11.3",
    "lastSent": "2024-04-29T15:06:39-04:00",
    "lastReceived": "2024-04-29T15:06:39-04:00",
    "observedUptime": "0",
    "observedSubnetUptimes": {},
    "trackedSubnets": [
        "25BsTBm8GQZirHUUKoRSjed8NxjTxtnXP1FvGNanV3QRuizkdt",
        "2J8TLHUDfWuGnEuKKG6n47rkU9YcocEtpxCAaFg447doVBYLEH",
        "Ck7LqxbQX5wzqy6w6UHRoy6EDB1jeEb8AMa6V6vXyn4csc8Mu",
        "SEerb4ZQYMPFiSaekS1LqnJqPgYR5uPYBR9ggPjfxc1SaeBSj",
        "dLyxcugrVZarrCSREN4B7idVwoRzEbP3kzyJN2BTsoRqYggN5"
    ],
    "supportedACPs": [
        23,
        24,
        25,
        30,
        31,
        41,
        62
    ],
    "objectedACPs": [],
    "benched": []
}