test: v20 contracts integration

[skosito]

Description

• created from v20.0.2 tag, do not need to be merged since there is nothing to release it is just to run needed tests
• it integrates latest v20 protocol contract changes with v20 release branch here to verify if e2e tests running
• changes are just in e2e tests and example test contract

How Has This Been Tested?

• Tested CCTX in localnet
• Tested in development environment
• Go unit tests
• Go integration tests
• Tested via GitHub Actions

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 66.74%. Comparing base (c05a91c) to head (de7cd3d).
Report is 4 commits behind head on release/v20.

Files with missing lines	Patch %	Lines
pkg/contracts/testdappv2/TestDAppV2.go	0.00%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           release/v20    #3008   +/-   ##
============================================
  Coverage        66.73%   66.74%           
============================================
  Files              364      364           
  Lines            20573    20577    +4     
============================================
+ Hits             13730    13734    +4     
  Misses            6211     6211           
  Partials           632      632           

Files with missing lines	Coverage Δ
pkg/contracts/testdappv2/TestDAppV2.go	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes