validator: Added --health-check-slot-distance (bp #10324)

[mergify]

This is an automated backport of pull request #10324 done by Mergify

Cherry-pick of eb45aaa has failed:

On branch mergify/bp/v1.1/pr-10324
Your branch is up to date with 'origin/v1.1'.

You are currently cherry-picking commit eb45aaa6c.
  (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/rpc.rs
	modified:   validator/src/main.rs

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

	both modified:   core/src/rpc_service.rs

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[solana-grimes]

💔 Unable to automerge due to CI failure

[codecov]

Codecov Report

Merging #10330 into v1.1 will increase coverage by 0.0%.
The diff coverage is 100.0%.

@@          Coverage Diff           @@
##            v1.1   #10330   +/-   ##
======================================
  Coverage   80.7%    80.7%           
======================================
  Files        288      288           
  Lines      66593    66599    +6     
======================================
+ Hits       53772    53777    +5     
- Misses     12821    12822    +1