only trigger VPs from a fst addr of a key segment

[tzemanovic]

Describe your changes

first step toward #2629 - the next step is to update VPs to enforce that insert_verifier has been called with an address that has to authorize the tx (#2934).

Indicate on which release or other PRs this topic is based on

0.32.0

Checklist before merging to draft

• I have added a changelog
• Git history is in acceptable state

[codecov]

Codecov Report

Attention: Patch coverage is 27.90698% with 31 lines in your changes are missing coverage. Please review.

Project coverage is 53.43%. Comparing base (5e0b162) to head (38c9cc2).
Report is 4 commits behind head on main.

Files	Patch %	Lines
crates/tx_prelude/src/proof_of_stake.rs	0.00%	27 Missing ⚠️
crates/apps/src/lib/bench_utils.rs	0.00%	2 Missing ⚠️
crates/tx_prelude/src/token.rs	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2928      +/-   ##
==========================================
- Coverage   53.44%   53.43%   -0.02%     
==========================================
  Files         310      310              
  Lines      101574   101611      +37     
==========================================
+ Hits        54288    54294       +6     
- Misses      47286    47317      +31     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.