fix: move release configs to native-image-shared-config

[mpeddada1]

To address release job failure:

[ERROR] No plugin found for prefix 'nexus-staging' in the current project and in the plugin groups [org.apache.maven.plugins, org.codehaus.mojo] available from the repositories [local (/root/.m2/repository), central ([https://repo.maven.apache.org/maven2](https://www.google.com/url?q=https://repo.maven.apache.org/maven2&sa=D))] -> [Help 1]

The nexus-staging-maven-plugin was only declared in java-shared-config initially and not in native-image-shared-config (the parent).

[suztomo]

Nits with indent. Let's get error messages.

[mpeddada1]

Confirmed that the staging job passed:

[INFO] --- maven-deploy-plugin:3.1.1:deploy (default-deploy) @ google-cloud-shared-config-parent ---
[INFO] Skipping artifact deployment
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO] 
[INFO] Native Image Shared Config 1.7.0 ................... SUCCESS [02:22 min]
[INFO] Google Cloud Shared Config 1.7.0 ................... SUCCESS [02:25 min]
[INFO] google-cloud-shared-config-parent 0.1.0-SNAPSHOT ... SUCCESS [ 22.563 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  05:11 min
[INFO] Finished at: 2023-12-07T16:55:00Z
[INFO] ------------------------------------------------------------------------
Finished uploading the staging repository
AUTORELEASE_PR is not specified. Not promoting the release.