Daniel Widdis

README on site is broken after latest site plugin changes

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Looking at [the main site](https://www.oshi.ooo/) (built from [here](https://github.com/oshi/oshi/tree/master/src/site/markdown)) the content cuts off after the initial table of content links, which don't work (since they link internally to the same page).

### What is the bug? Backend role filtering doesn't handle the case where a template is created/provisioned with an admin (null) user, but accessed with a user with backend roles....

[FEATURE] Use ML Commons validation methods in Workflow parsing

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### Is your feature request related to a problem? While we currently use the API spec to validate existence of fields and do basic format validation, ML Commons performs some...

[BUG] Snapshot publication for 2.19.4 is not available at Maven Central

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### What is the bug? In a downstream repo depending on 2.19.4: ``` > Could not find org.opensearch.plugin:opensearch-job-scheduler:2.19.4.0-SNAPSHOT. Searched in the following locations: - https://repo.maven.apache.org/maven2/org/opensearch/plugin/opensearch-job-scheduler/2.19.4.0-SNAPSHOT/maven-metadata.xml - https://repo.maven.apache.org/maven2/org/opensearch/plugin/opensearch-job-scheduler/2.19.4.0-SNAPSHOT/opensearch-job-scheduler-2.19.4.0-SNAPSHOT.pom - file:/home/runner/.m2/repository/org/opensearch/plugin/opensearch-job-scheduler/2.19.4.0-SNAPSHOT/maven-metadata.xml -...

This PR updates the Gradle build files to fix compatibility with Gradle 9. ## Problem The current syntax using `$System.env.VARIABLE_NAME` for accessing environment variables is not compatible with Gradle 9....