Adapt CI test to UltraGreen CIP-52 changes

[karlb]

Transferring the fees to the FeeHandler instead of the Governance contract requires update in the CI tests.

This should be part of the UltraGreen changes, but requires a celo-blockchain version including celo-org/celo-blockchain#2049 (thus the current CI failures for governance and transfers).

[arthurgousset]

Quick check-in: Is there a reason this PR is still open after @carterqw2's approval?

[karlb]

There are still CI failures preventing merging this PR. Does anyone know what the problem is, or should I take a look?

[karlb]

  70) Transfer tests
       Transfer with Demurrage >
         lightest Node >
           when there is demurrage of 50% applied
             when setting a gas amount greater than the amount of gas necessary
               should halve the FeeHandler's Celo Dollar balance then increment it by the base portion of the gas fees:

      AssertionError: expected '0' to equal '7100000000000'
      + expected - actual

      -0
      +7100000000000

Isn't demurrage/stability fee remove? Why do we still have tests for this?

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[socket-security]

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[karlb]

Since contracts v10 have been merged to master and master is green, these changes seem not to be necessary, anymore.