Truncate Logs from bottom up

### What feature do you want to see added?

Hi,

Due to the GitHub character limit on the GitHub Checks api (see background here: https://github.com/jenkinsci/github-checks-plugin/issues/345), our logs often get truncated. We are wondering if you are open to truncating from the bottom of the logs up rather than the existing top down now, since most relevant failure logs are at the bottom. Or, is there an easy way you could make this configurable?

Thank you!

### Upstream changes

_No response_

### Are you interested in contributing this feature?

_No response_