Adds debug trace for masp epochs in asset types (backport #4101)

[mergify]

Describe your changes

Checklist before merging

• If this PR has some consensus breaking changes, I added the corresponding breaking:: labels
  • This will require 2 reviewers to approve the changes
• If this PR requires changes to the docs or specs, a corresponding PR is opened in the namada-docs repo
  • Relevant PR if applies:
• If this PR affects services such as namada-indexer or namada-masp-indexer, a corresponding PR is opened in that repo
  • Relevant PR if applies:

---

This is an automatic backport of pull request #4101 done by [Mergify](https://mergify.com).

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 74.58%. Comparing base (6bd88fc) to head (2c20ab2).
Report is 4 commits behind head on maint-0.46.

Files with missing lines	Patch %	Lines
crates/shielded_token/src/masp/shielded_wallet.rs	50.00%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           maint-0.46    #4113      +/-   ##
==============================================
- Coverage       74.58%   74.58%   -0.01%     
==============================================
  Files             341      341              
  Lines          107484   107488       +4     
==============================================
+ Hits            80166    80168       +2     
- Misses          27318    27320       +2     

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