add configurable iterations + warmup iterations to the percolator workload

[OVI3D0]

Description

Adds configurable iterations + warmup iterations to the percolator workload

Issues Resolved

#403

Testing

• New functionality includes testing

Tested by cherry-picking changes onto branches 1, 3 and 7 and running integ tests

Backport to Branches:

• 6
• 7
• 1
• 2
• 3

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[opensearch-trigger-bot]

The backport to 7 failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/backport-7 7
# Navigate to the new working tree
pushd ../.worktrees/backport-7
# Create a new branch
git switch --create backport/backport-455-to-7
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 f9c3a0b9aadbf03373dbc3c7bb0630b1c732c9c8
# Push it to GitHub
git push --set-upstream origin backport/backport-455-to-7
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/backport-7

Then, create a pull request where the base branch is 7 and the compare/head branch is backport/backport-455-to-7.