accounts-db: Remove deprecated is_hash_valid

[fkouteib]

Problem

is_hash_valid() has been deprecated since 2.0.0

Summary of Changes

Remove deprecated function

[brooksprumo]

Seems fine. I'm only superficially familiar with the blockhash queue; why are we only removing this now? (Wondering if there's a forcing function, or just optimistic.)

[fkouteib]

Seems fine. I'm only superficially familiar with the blockhash queue; why are we only removing this now? (Wondering if there's a forcing function, or just optimistic.)

No Forcing function for this. I don't have the historical context why it stuck around until now. Just a latent cleanup before the 3.0 major release.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.2%. Comparing base (b6e29bd) to head (9628ae0).
⚠️ Report is 2801 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #7122    +/-   ##
========================================
  Coverage    83.2%    83.2%            
========================================
  Files         853      853            
  Lines      374069   374013    -56     
========================================
+ Hits       311467   311512    +45     
+ Misses      62602    62501   -101     

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