chore: filter transfers from the rgb digest

[rabbitz]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 66.20%. Comparing base (f373f6b) to head (1c95638).
Report is 70 commits behind head on develop.

❗ Current head 1c95638 differs from pull request most recent head a5a987d. Consider uploading reports for the commit a5a987d to get more accurate results

Files	Patch %	Lines
.../controllers/api/v2/ckb_transactions_controller.rb	0.00%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1692      +/-   ##
===========================================
- Coverage    67.56%   66.20%   -1.36%     
===========================================
  Files          289      327      +38     
  Lines         7944     8803     +859     
===========================================
+ Hits          5367     5828     +461     
- Misses        2577     2975     +398     

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