Update UpdateAutoFollowPatternIT "test auto follow stats" to wait for 60 seconds

[monusingh-1]

UpdateAutoFollowPatternIT test "test auto follow stats" was waiting for 30 seconds to poll for shard replication task to start. This was causing intermittent failure as shard replication task may take more time to start.

Description

[Describe what this change achieves]

Issues Resolved

[List any issues this PR will resolve]

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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[opensearch-trigger-bot]

The backport to 2.x 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-2.x 2.x
# Navigate to the new working tree
cd .worktrees/backport-2.x
# Create a new branch
git switch --create backport/backport-745-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 f9746e54d030828a1ea0721456fe10dd094010cb
# Push it to GitHub
git push --set-upstream origin backport/backport-745-to-2.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-745-to-2.x.