Update the maven snapshot publish endpoint and credential

[zelinh]

Description

Update the Maven Snapshots publish URL in accordance with the recent Sonatype migration.
https://central.sonatype.org/publish/publish-portal-snapshots/

We have stored the onepassword token in this repo secrets and new credentials for Sonatypes username & password have been stored in onepassword. These credentials will be exported as env variables which used by maven publish.

Related Issues

Part of a campaign issue opensearch-project/opensearch-build#5551

Check List

• New functionality includes testing.
• New functionality has been documented.
• New functionality has javadoc added.
• New functionality has a user manual doc added.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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[zelinh]

Not sure some of logics here in sql repo. Might need some help.

According to Nexus Sonatype, https://central.sonatype.org/publish/publish-portal-snapshots/
For publish and consumption, we would use endpoint https://central.sonatype.com/repository/maven-snapshots/
But for browsing or downloading from script, we may need to use https://central.sonatype.com/service/rest/repository/browse/maven-snapshots

Also for publish-snapshots-and-grammar-files.yml workflow, I see some curl commands trying to push artifacts. We may also need to verify the backward compatibility of the new endpoint or onboard with a new way.

[gaiksaya]

Hi maintainers,
Please add the correct label to backport to active branches.
Would recommend backporting this PR to 2.19 for 2.19.x artifacts for future releases.

Thanks!