validator: Forge a confirmed root before halting for RPC inspection (bp #10061)

[mergify]

This is an automated backport of pull request #10061 done by Mergify

Cherry-pick of 1da1667 has failed:

On branch mergify/bp/v1.0/pr-10061
Your branch is up to date with 'origin/v1.0'.

You are currently cherry-picking commit 1da166792.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:

	modified:   core/src/validator.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)

	both modified:   core/src/commitment.rs

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[solana-grimes]

😱 New commits were pushed while the automerge label was present.

[codecov]

Codecov Report

Merging #10066 into v1.0 will decrease coverage by 0.0%.
The diff coverage is 0.0%.

@@           Coverage Diff            @@
##            v1.0   #10066     +/-   ##
========================================
- Coverage   80.1%    80.0%   -0.1%     
========================================
  Files        274      274             
  Lines      60352    60354      +2     
========================================
- Hits       48349    48335     -14     
- Misses     12003    12019     +16