tests: cw20 integration test

[gsk967]

Description

closes: #XXXX

---

Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• added appropriate labels to the PR
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[codecov]

Codecov Report

Merging #2007 (9c61f34) into sai/wasm_handler (a3c878d) will decrease coverage by 0.13%.
The diff coverage is n/a.

@@                 Coverage Diff                  @@
##           sai/wasm_handler    #2007      +/-   ##
====================================================
- Coverage             68.70%   68.58%   -0.13%     
====================================================
  Files                   116      116              
  Lines                  9373     9329      -44     
====================================================
- Hits                   6440     6398      -42     
- Misses                 2452     2453       +1     
+ Partials                481      478       -3     

see 5 files with indirect coverage changes