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Use slightly higher min_avg_fee compared to max_gas_price (#1246)

Currently we calculate the min avg fee and max gas price so that if the
solution earns exactly min avg fee it can be submitted at exactly fast
gas price while not losing money.
This is a problem when the gas price or eth price moves slightly between
the start of solution creation and submitting. To be more robust this
commit adds 10% to the min average fee.

Context for this is that I saw a lot of " Solution does not generate enough fees for the transaction to execute quickly enough" in the logs with the open solver and I think this is the reason. Also added more debug logs so I can check the logs in more detail in the future.

### Test Plan
Adjusted unit tests and added some debug prints .

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