Add additional Escrow ITs

[sappenin]

• Add Finish + Cancel ITs for when the sender and receiver are the same.
• Add IT for EscrowCreate with insufficient funds.
• Fix logging logic in AbstractIT to properly display network explorer URLs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.02%. Comparing base (85a1156) to head (94ef038).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #605   +/-   ##
=========================================
  Coverage     92.02%   92.02%           
  Complexity     1849     1849           
=========================================
  Files           383      383           
  Lines          5128     5128           
  Branches        436      436           
=========================================
  Hits           4719     4719           
  Misses          273      273           
  Partials        136      136           

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