Test NAM reward unshields in values_spanning_multiple_masp_digits

[sug0]

Describe your changes

• Increase masp fee payment gas limit to 65000
• Test NAM reward unshields in values_spanning_multiple_masp_digits.

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]

@sug0 with the increased gas for masp fee payment I believe this could close #3961

[sug0]

@Fraccaman ci is doing weird things here 😳

[Fraccaman]

what is happening?

[sug0]

test-integration is timing out in a weird way. it fails, but every step in the job succeeds

[Fraccaman]

just re-run it, no idea why it happen sometimes

[grarco]

just re-run it, no idea why it happen sometimes

Reran it 3 times, still no luck

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.88%. Comparing base (a871c33) to head (2bee742).
Report is 19 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3982   +/-   ##
=======================================
  Coverage   73.88%   73.88%           
=======================================
  Files         341      341           
  Lines      106444   106444           
=======================================
  Hits        78647    78647           
  Misses      27797    27797           

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