Add Ledger app unit tests to the Namada CI

[murisi]

Describe your changes

An attempt to add Ledger app unit tests to the Namada CI. These tests were created to complement the Ledger app E2E tests already in the CI at test-e2e-with-device-automation. Whereas the E2E tests comprehensively cover testing hardware wallet signing for a few cases, these unit tests focus on covering hardware wallet printing for hundreds of cases. More specifically, the following changes have been made:

• Made the CI automatically generate random transaction test vectors using the Namada client
  • Doing this has the side benefit of preventing code rot in the test vector generation code
• The CI then runs the Ledger app unit test code on the generated test vectors
  • Doing this helps automatically detect compatibility breaking changes in the transaction serializations
• Fixed regressions in the test vector generation code

See an example run of this new job here: https://github.com/murisi/namada/actions/runs/12143664343/job/33861086521?pr=2

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:

[grarco]

Nice one here 👍🏻 , we were previously generating up to 10 headers and the other arb_transaction generators were only appending data for a single inner tx which was strange

[codecov]

Codecov Report

Attention: Patch coverage is 1.78571% with 55 lines in your changes missing coverage. Please review.

Project coverage is 74.54%. Comparing base (f027584) to head (490e616).
Report is 36 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/sdk/src/signing.rs	0.00%	55 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4140      +/-   ##
==========================================
- Coverage   74.56%   74.54%   -0.03%     
==========================================
  Files         341      341              
  Lines      107502   107549      +47     
==========================================
+ Hits        80160    80173      +13     
- Misses      27342    27376      +34     

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[Fraccaman]

Thanks murisi! I just want to make a couple of changes to the CI workflow before merging