Uses Display for error in VerifyAccountsHashInBackground's panic message

[brooksprumo]

Problem

If the initial accounts hash verification fails, the panic message prints out the error, but with Debug. This may not include useful information that Display would. Since this message is user/dev-facing, Display is more helpful.

Summary of Changes

Change the error to be printed with Display instead of Debug.

Also, change the panic text to match the logs when the bg process starts/stops:

solana/runtime/src/bank.rs

Line 7165 in c6451e9

info!("Initial background accounts hash verification has started");

Backports

I'd also like to backport this to v1.17, to aid in debugging any issues sooner.

[mergify]

Backports to the beta branch are to be avoided unless absolutely necessary for fixing bugs, security issues, and perf regressions. Changes intended for backport should be structured such that a minimum effective diff can be committed separately from any refactoring, plumbing, cleanup, etc that are not strictly necessary to achieve the goal. Any of the latter should go only into master and ride the normal stabilization schedule. Exceptions include CI/metrics changes, CLI improvements and documentation updates on a case by case basis.

[codecov]

Codecov Report

Merging #34219 (4411d1d) into master (c6451e9) will decrease coverage by 0.1%.
The diff coverage is 100.0%.

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #34219     +/-   ##
=========================================
- Coverage    81.9%    81.9%   -0.1%     
=========================================
  Files         819      819             
  Lines      219338   219338             
=========================================
- Hits       179695   179664     -31     
- Misses      39643    39674     +31     

[HaoranYi]

lgtm