added semi-integration test for relayed v2 multi nft transfers

[bogdan-rosianu]

Reasoning behind the pull request

• there was no integration test with such scenarios

Proposed changes

• added a semi-integration test that covers multiple situations of multi tokens transfers via relayed v2

Testing procedure

• n/a

Pre-requisites

Based on the Contributing Guidelines the PR author and the reviewers must check the following requirements are met:

• was the PR targeted to the correct branch?
• if this is a larger feature that probably needs more than one PR, is there a feat branch created?
• if this is a feat branch merging, do all satellite projects have a proper tag inside go.mod?

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (50a3d8a) 79.41% compared to head (341e430) 79.41%.

❗ Current head 341e430 differs from pull request most recent head 26ace54. Consider uploading reports for the commit 26ace54 to get more accurate results

Additional details and impacted files

@@              Coverage Diff              @@
##           rc/v1.6.0    #5177      +/-   ##
=============================================
- Coverage      79.41%   79.41%   -0.01%     
=============================================
  Files            691      691              
  Lines          89197    89197              
=============================================
- Hits           70839    70836       -3     
- Misses         13162    13165       +3     
  Partials        5196     5196              

see 1 file with indirect coverage changes

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