integration-tests: fee too low/too high

[tynes]

Description
Enforce fees in the integration tests so that
tests can be written to cover the fee rejection
logic. This was previously unit tested in geth
without end to end test coverage. Projects
depend on the error strings returned, so it is
important to have test coverage over them.

Previously the owner of the gas price oracle was set as
the same wallet used in the l2Wallet in the
integration tests. This would allow it to send
0 gas price transactions, as the sequencer will not
charge for transactions from the owner of the gpo.
The sequencer also updates the cached values
from the contract whenever the owner of the gpo
sends a transaction, which results in extra
logs and makes the test environment less realistic.

Updates the integration tests to work when fees
are enforced by the sequencer. This allows for
integration test coverage of the cases where transactions
are rejected when fees are too low or too high.

[changeset-bot]

🦋 Changeset detected

Latest commit: b1fa3f3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@eth-optimism/integration-tests	Patch

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[tynes]

Enforcing fees may have downstream effects of impacting users that relied on gas price 0 transactions. There isn't really a good way to test these cases in the integration tests without turning on fee enforcement. Users can unset that config at runtime if they so choose

[codecov-commenter]

Codecov Report

Merging #1736 (41189ec) into develop (e0589e0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1736   +/-   ##
========================================
  Coverage    71.90%   71.90%           
========================================
  Files           69       69           
  Lines         2310     2310           
  Branches       345      345           
========================================
  Hits          1661     1661           
  Misses         649      649           

Flag	Coverage Δ
batch-submitter	62.07% <ø> (ø)
contracts	87.96% <ø> (ø)
core-utils	56.53% <ø> (ø)
data-transport-layer	38.23% <ø> (ø)
message-relayer	70.86% <ø> (ø)

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[tynes]

We have gotten the go ahead with synthetix to merge this PR