Reduce grace ticks, and ignore grace ticks for missing leaders (bp #7764)

[mergify]

This is an automated backport of pull request #7764 done by Mergify.io

Cherry-pick of 156292e has failed:

On branch mergify/bp/v0.22/pr-7764
Your branch is up to date with 'origin/v0.22'.

You are currently cherry-picking commit 156292e40.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

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

	both modified:   core/src/poh_recorder.rs
	both modified:   ledger/src/lib.rs

no changes added to commit (use "git add" and/or "git commit -a")

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[solana-grimes]

💔 Unable to automerge due to CI failure

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (v0.22@6c2534a). Click here to learn what that means.
The diff coverage is 71.7%.

@@           Coverage Diff           @@
##             v0.22   #7779   +/-   ##
=======================================
  Coverage         ?   66.3%           
=======================================
  Files            ?     243           
  Lines            ?   62959           
  Branches         ?       0           
=======================================
  Hits             ?   41798           
  Misses           ?   21161           
  Partials         ?       0

[carllin]

@pgarg66, looks like there are conflicts :(

[mvines]

Oh crap, I didn't see that this didn't make it into 0.22.3 😢

[pgarg66]

Oh crap, I didn't see that this didn't make it into 0.22.3 😢

It is due to missing blocktree -> blockstore rename PR. Do we plan to merge that to v22? If not, I can rework this PR to use blocktree

[garious]

Blockstore PR should already be in 0.22

[pgarg66]

Blockstore PR should already be in 0.22

Let me check. Maybe some other overlapping change is causing the merge conflicts then.

[pgarg66]

Blockstore PR should already be in 0.22

Let me check. Maybe some other overlapping change is causing the merge conflicts then.

Looks like the ordering of backport caused these merge conflicts. I am rebasing the PR manually.