e2e: add bridge e2e tests

[tmigone]

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This PR adds e2e tests to the bridge contracts (cross checks addresses configured in L1GraphTokenGateway, L2GraphTokenGateway, L1GraphToken, L2GraphToken and BridgeEscrow match the deployed contract addresses).

[codecov[bot]]

Codecov Report

Base: 91.53% // Head: 91.53% // No change to project coverage :thumbsup:

Coverage data is based on head (a1c3dcd) compared to base (6de2ea9). Patch has no changes to coverable lines.

Additional details and impacted files

@@                  Coverage Diff                   @@
##           tmigone/e2e-l2-bridge     #720   +/-   ##
======================================================
  Coverage                  91.53%   91.53%           
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  Files                         42       42           
  Lines                       1984     1984           
  Branches                     346      346           
======================================================
  Hits                        1816     1816           
  Misses                       168      168           

Flag	Coverage Δ
unittests	91.53% <ø> (ø)

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