perf: Make ResetBatch accumulate a minimum batch size (backport #729)

[mergify[bot]]

This is an automatic backport of pull request #729 done by Mergify. Cherry-pick of 747bc123a38b5803b470fb0faa649207a6c2d739 has failed:

On branch mergify/bp/release/v0.20.x/pr-729
Your branch is up to date with 'origin/release/v0.20.x'.

You are currently cherry-picking commit 747bc12.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
    modified:   nodedb.go

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

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[ValarDragon]

Oh let me try to update the cosmos-DB version here then

[ValarDragon]

Adding cosmos-DB in #768

[tac0turtle]

closing in favour of #783