Check masp action

[grarco]

Describe your changes

Changes get_masp_section_ref to return an error if more than one MASP action is found (MASP VP doesn't handle multiple Transaction objects).
Also adjusts the logic, in case of an error propagation from tx execution, to prevent committing the changes applied by the failed tx.

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

[codecov]

Codecov Report

Attention: Patch coverage is 72.41379% with 24 lines in your changes missing coverage. Please review.

Project coverage is 61.27%. Comparing base (511f079) to head (abd4692).
Report is 56 commits behind head on main.

Files	Patch %	Lines
crates/node/src/protocol.rs	42.10%	11 Missing ⚠️
crates/shielded_token/src/vp.rs	0.00%	8 Missing ⚠️
crates/tx/src/action.rs	68.75%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3632   +/-   ##
=======================================
  Coverage   61.27%   61.27%           
=======================================
  Files         312      312           
  Lines      101338   101369   +31     
=======================================
+ Hits        62092    62111   +19     
- Misses      39246    39258   +12     

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