Don't keep the last commit before the earliest commit to retain

Don't keep the last commit before the earliest commit to retain

According to the document of {{{}hoodie.cleaner.commits.retained{}}}:

Number of commits to retain, without cleaning. This will be retained for num_of_commits * time_between_commits (scheduled). This also directly translates into how much data retention the table supports for incremental queries.
 
We only need to keep the number of commit configured through parameters {{{}hoodie.cleaner.commits.retained{}}}.
And the commit retained by clean is completed.This ensures that “This will be retained for num_of_commits * time_between_commits” in the document.

So we don't need to keep the last commit before the earliest commit to retain,If we want to keep more versions, we can increase the parameters {{hoodie.cleaner.commits.retained}}

## JIRA info

- Link: https://issues.apache.org/jira/browse/HUDI-3954
- Type: Improvement