Update Sonatype publishing URL to Central Portal (#1090)

It has been announced that the Sonatype OSSRH will reach EOL soon:
https://central.sonatype.org/news/20250326_ossrh_sunset/

We currently publish the ADOT Java and the UDP exporter to Sonatype and
the migration to Central Portal is recommended.

Sonatype publishing URL updated as per [this sonatype
doc](https://central.sonatype.org/publish/publish-portal-ossrh-staging-api/#configuration)
and the internal recommendation.


By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

---------

Co-authored-by: Steve Liu <liustve@amazon.com>

Author: srprash

build.gradle.kts

@@ -40,8 +40,8 @@ nebulaRelease {
 nexusPublishing {
   repositories {
     sonatype {
-      nexusUrl.set(uri("https://aws.oss.sonatype.org/service/local/"))
-      snapshotRepositoryUrl.set(uri("https://aws.oss.sonatype.org/content/repositories/snapshots/"))
+      nexusUrl.set(uri("https://ossrh-staging-api.central.sonatype.com/service/local/"))
+      snapshotRepositoryUrl.set(uri("https://central.sonatype.com/repository/maven-snapshots/"))
       username.set(System.getenv("PUBLISH_TOKEN_USERNAME"))
       password.set(System.getenv("PUBLISH_TOKEN_PASSWORD"))
     }

exporters/aws-distro-opentelemetry-xray-udp-span-exporter/build.gradle.kts

@@ -101,8 +101,8 @@ tasks.create("printVersion") {
 nexusPublishing {
   repositories {
     sonatype {
-      nexusUrl.set(uri("https://aws.oss.sonatype.org/service/local/"))
-      snapshotRepositoryUrl.set(uri("https://aws.oss.sonatype.org/content/repositories/snapshots/"))
+      nexusUrl.set(uri("https://ossrh-staging-api.central.sonatype.com/service/local/"))
+      snapshotRepositoryUrl.set(uri("https://central.sonatype.com/repository/maven-snapshots/"))
       username.set(System.getenv("PUBLISH_TOKEN_USERNAME"))
       password.set(System.getenv("PUBLISH_TOKEN_PASSWORD"))
     }

exporters/aws-distro-opentelemetry-xray-udp-span-exporter/settings.gradle.kts

@@ -6,7 +6,7 @@ dependencyResolutionManagement {
     mavenLocal()
 
     maven {
-      setUrl("https://oss.sonatype.org/content/repositories/snapshots")
+      setUrl("https://central.sonatype.com/repository/maven-snapshots/")
     }
   }
 }
@@ -16,4 +16,4 @@ pluginManagement {
     id("io.github.gradle-nexus.publish-plugin") version "2.0.0"
     id("nebula.release") version "18.0.6"
   }
-}
+}

settings.gradle.kts

@@ -33,7 +33,7 @@ dependencyResolutionManagement {
     mavenLocal()
 
     maven {
-      setUrl("https://oss.sonatype.org/content/repositories/snapshots")
+      setUrl("https://central.sonatype.com/repository/maven-snapshots/")
     }
   }
 }