Move React Native publishing URLs to Central Portal (facebook#51693)

Summary:
Pull Request resolved: facebook#51693

This moves React Native to use the Central Portal URLs rather than the legacy OSSRH ones.
See https://github.com/gradle-nexus/publish-plugin for more context.

Changelog:
[Internal] [Changed] -

Reviewed By: cipolleschi

Differential Revision: D75673984

fbshipit-source-id: 1de6746809eed72f232eac0c3fb4d809c2046620

Author: cortinico

build.gradle.kts

@@ -55,6 +55,8 @@ nexusPublishing {
     sonatype {
       username.set(sonatypeUsername)
       password.set(sonatypePassword)
+      nexusUrl.set(uri("https://ossrh-staging-api.central.sonatype.com/service/local/"))
+      snapshotRepositoryUrl.set(uri("https://central.sonatype.com/repository/maven-snapshots/"))
     }
   }
 }