Wait interval, before finalized peers re-checked

[farazdagi]

What type of PR is this?

Other/Improvement

What does this PR do? Why is it needed?

• Since there's no point in quickly spinning on existing peers, when no peers with high enough finalized slot is found, we add a period of 15s (configurable) before proceeding.
• Number of errors tolerated are increased to 1000, so 1000*15 sec (~4 hours) of possible init-sync spinning is allowed by this update, then init-sync gives up.

Which issues(s) does this PR fix?

Fixes #

Other notes for review

[codecov]

Codecov Report

Merging #7032 into master will not change coverage.
The diff coverage is n/a.

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  Coverage   62.54%   62.54%           
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  Files         401      401           
  Lines       31617    31617           
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  Hits        19775    19775           
  Misses       9059     9059           
  Partials     2783     2783