… algorithm comparison (elastic#203482)

## Summary

Fixes elastic#203151

Adds a normalization for the `kql_query`, `eql_query`, and `esql_query`
fields that trims the whitespace from the beginning and end of query
strings for a more robust comparison in the diff algorithms. Since
whitespace before or after the query string is purely a formatting
choice and doesn't impact the query itself, we discard the excess
whitespace characters before the direct string comparison.

### Checklist

Check the PR satisfies following conditions.

Reviewers should verify this PR satisfies this list as well.

- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [x] [Flaky Test
Runner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1) was
used on any tests changed

(cherry picked from commit 0294838)