chore(code): Some WAL entries fail to decode

[ancazamfir]

Closes: #XXX
Sometime wal entries fail to decode with errors like this:

2025-02-07T20:30:44.054030Z ERROR node{moniker=test-2}:wal{height=144}: Failed to decode WAL entry 4: failed to fill whole buffer

Looks like for PrevoteTimeLimit and PrecommitTimeLimit we still write something to the WAL (just the tag) and later fail to decode.

• Add test that shows the error (needs actual failure, cleanup)
• Fix the error

---

PR author checklist

For all contributors

• Reference GitHub issue
• Ensure PR title follows the conventional commits spec

For external contributors

• Maintainers of Malachite are allowed to push changes to the branch

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.16%. Comparing base (614a46c) to head (aebabcb).

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #840      +/-   ##
==========================================
+ Coverage   75.79%   76.16%   +0.36%     
==========================================
  Files         169      169              
  Lines       14682    14683       +1     
==========================================
+ Hits        11128    11182      +54     
+ Misses       3554     3501      -53     

Flag	Coverage Δ
integration	75.87% <ø> (+0.36%)	⬆️
mbt	20.63% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
core	∅ <ø> (∅)
engine	∅ <ø> (∅)
app	∅ <ø> (∅)
starknet	∅ <ø> (∅)