chore: migrate Sonatype publishing to central-publishing-maven-plugin

[Copilot]

The legacy OSSRH staging approach (ossrh-staging-api.central.sonatype.com) is EOL. This migrates to the officially supported central-publishing-maven-plugin (v0.10.0) and removes the manual curl publish trigger.

pom.xml

• Drop legacy OSSRH <repository> from distributionManagement; snapshot repo id ossrh → central
• Add central-publishing-maven-plugin 0.10.0 to pluginManagement
• Add plugin to release-sign-artifacts profile with extensions=true, autoPublish=true, waitUntil=published — takes over the deploy lifecycle and handles full publish cycle via Central Portal API

release.yml

• server-id: ossrh → central
• Remove manual curl POST to ossrh-staging-api.central.sonatype.com/manual/upload (now handled by autoPublish=true)
• Env vars: OSSRH_USERNAME/OSSRH_TOKEN → CENTRAL_USERNAME/CENTRAL_TOKEN

snapshot.yml

• server-id: ossrh → central; env vars renamed to match

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: brendandburns / name: Brendan Burns (a1ecf0d)

[kubernetes-prow]

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