eth/polygon: peer issues need better management

[buck54321]

There have been reports that unstable connections result in notifications spam.

Also, starting with the default providers can result in a lot of error messages.

2024-06-20 00:27:55.571 [WRN] CORE: Wallet for asset polygon has zero network peers!
2024-06-20 00:28:08.838 [WRN] CORE: notify: |WARNING| (walletconfig) Wallet network issue - Polygon wallet has no network peers!
2024-06-20 00:28:10.427 [ERR] CORE[polygon]: failed to get best hash: HeaderByNumber error: Post "https://polygon-amoy.blockpi.network/v1/rpc/public": context deadline exceeded: HeaderByNumber error: Post "https://rpc-amoy.polygon.technology": context deadline exceeded: HeaderByNumber error: context deadline exceeded
2024-06-20 00:28:13.525 [ERR] CORE[polygon]: failed to get best hash: HeaderByNumber error: write tcp 192.168.1.11:58023->104.18.23.142:443: i/o timeout: HeaderByNumber error: Post "https://rpc-amoy.polygon.technology": context deadline exceeded: HeaderByNumber error: Post "https://polygon-amoy.blockpi.network/v1/rpc/public": context deadline exceeded
2024-06-20 00:28:15.957 [ERR] CORE: error updating "eth" balance: pending balance error: balance error: error fetching multi-balance: insufficient funds for gas * price + value: address 0x6Ca80C7Bc5940B3Da83639BdE18058DE81938C8a have 0 want 1050000000
2024-06-20 00

That last one in particular doesn't even make sense. It's a read-only transaction. Regardless, those shouldn't be logged if the user is on the default provider list.