Enable onboard + bridge in single transaction for Cadence -> EVM path

[sisyphusSmiling]

Closes: #43

As mentioned in #43, due to limitations in Cadence contract deployments that break bridge request atomicity, we can only support onboard & bridge transactions for the Cadence to EVM path. If the Cadence runtime at some point in the future allows for contracts to be available in the runtime within the same transaction they're deployed, we should be able to make similar changes to supporting transactions without the need to alter contract code.

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.47%. Comparing base (428634e) to head (7dc7ef6).
Report is 38 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #44      +/-   ##
==========================================
+ Coverage   82.88%   85.47%   +2.58%     
==========================================
  Files          18       18              
  Lines         818      819       +1     
==========================================
+ Hits          678      700      +22     
+ Misses        140      119      -21     

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