vote-program: tests: test bls pubkey rotation

[buffalojoec]

No description provided.

[mergify]

The Firedancer team maintains a line-for-line reimplementation of the
native programs, and until native programs are moved to BPF, those
implementations must exactly match their Agave counterparts.
If this PR represents a change to a native program implementation (not
tests), please include a reviewer from the Firedancer team. And please
keep refactors to a minimum.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.2%. Comparing base (85c24be) to head (74be590).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #11998    +/-   ##
========================================
  Coverage    83.2%    83.2%            
========================================
  Files         859      859            
  Lines      321697   321782    +85     
========================================
+ Hits       267851   267966   +115     
+ Misses      53846    53816    -30     

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