[sBTC DR] Add test for txid in romeo

[friedger]

Description

This PR

• adds a test that shows txids are passed correctly to the contract
• see Romeo should pass the unreversed txid to asset contract #164

[codecov]

Codecov Report

Merging #181 (11cd02e) into main (937456c) will increase coverage by 46.69%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #181       +/-   ##
===========================================
+ Coverage   38.01%   84.71%   +46.69%     
===========================================
  Files          40        4       -36     
  Lines        4714      157     -4557     
  Branches        0       28       +28     
===========================================
- Hits         1792      133     -1659     
+ Misses       2922       22     -2900     
- Partials        0        2        +2     

Flag	Coverage Δ
unittests	84.71% <ø> (?)

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see 44 files with indirect coverage changes

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[friedger]

Replaced by #184