SOLR-16865 : Solr should warn about low disk space upon startup

[culmat]

https://issues.apache.org/jira/browse/SOLR-16865

Description

SOLR starts even with data directories on partitions with low disk space, which leads to crashes after the start.

Solution

Warn on the user on start up.

Tests

Manual inspection.

Checklist

Please review the following and check all that apply:

• [x] I have reviewed the guidelines for How to Contribute and my code conforms to the standards described there to the best of my ability.
• [x] I have created a Jira issue and added the issue ID to my pull request title. ( was existing)
• [x] I have given Solr maintainers access to contribute to my PR branch. (optional but recommended)
• [x] I have developed this patch against the main branch.
• [x] I have run ./gradlew check.
• [ ] I have added tests for my changes.
• [ ] I have added documentation for the Reference Guide