branch_10_0 backport for "--user-managed" with example (-e) on Windows (cherrypicked from 3f3a2d5)

[rahulgoswami]

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

Description

branch_10_0 backport for #4074

Tests

"solr start -e techproducts --user-managed" starts example in user-managed mode on Windows with this fix.

Checklist

Please review the following and check all that apply:

• I have reviewed the guidelines for How to Contribute and my code conforms to the standards described there to the best of my ability.
• I have created a Jira issue and added the issue ID to my pull request title.
• I have given Solr maintainers access to contribute to my PR branch. (optional but recommended, not available for branches on forks living under an organisation)
• I have developed this patch against the main branch.
• I have run ./gradlew check.
• I have added tests for my changes.
• I have added documentation for the Reference Guide
• I have added a changelog entry for my change

[rahulgoswami]

@epugh @dsmiley This is ready for merge. Please feel free to cherrypick (and discard the PR) or directly merge this PR...whatever you prefer. Thanks! Same with #4115

[epugh]

LGTM. I think you now have the commit bit right? I can do it if you want, but figure you should get the honours!

[rahulgoswami]

:) It's still in flight. Appreciate the sentiment though. Please go ahead if you get a chance. Thank you.

[rahulgoswami]

Thanks for merging @epugh . Could you please also take care of #4115 when you get a chance (Or cherrypick, whichever)? Thanks.

[epugh]

Done!