fix: only initial backtracking up to start offset when far behind #109
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We've already fixed the heartbeat on backtracking idle in #104. When looking at that issue, we also noticed that there was both the initial backtracking queries up to the initial offset, and then it later switched to more backtracking, even though it was far behind. Not essential to fix this, but we can correct it now.
Update the check to be up to or ahead of the initial offset. Extend the test to cover this scenario.