This commit reworks the CI pipeline to remove the use of Bintray for
publishing to Maven Central. In its place it adds a new
publishToCentral command to the release scripts. This command can be
used to publish a directory tree of artifacts to the Maven Central
gateway hosted by Sonatype.

Publishing consists of 4 steps:

1. Create the staging repository
2. Deploy artifacts to the repository
3. Close the repository
4. Release the repository

The command requires 3 arguments:

1. The type of release being performed
2. Location of a build info JSON file that describes the release
   that is to be deployed
3. Root of a directory structure, in Maven repository layout, that
   contains the artifacts to be deployed

Closes gh-25107