SOLR-17467: Fix Windows start script on 9x and optimize deprecation messages

[malliaridis]

https://issues.apache.org/jira/browse/SOLR-17467

Description

The Windows start script on 9x behaves differently than on main / 10.0, and fails with the message "mode. was unexpected at this time.". This mesage is coming from the deprecation warnings.

Solution

The fix moves the deprecation warnings to the dedicated mode setter functions and uses echo instead of @echo, which probably caused the execution error.

Additionally, this commit adds support for the --user-managed mode that allows the user to suppress the deprecation warning by being explicit about the current mode.

Tests

Not tests were altered.

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.
• [X] 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.
• [X] I have run ./gradlew check.
• [ ] I have added tests for my changes.
• [ ] I have added documentation for the Reference Guide