Migrate to central-publishing-maven-plugin and off oss-parent.

I missed these files in cl/782079419 because I was looking for... maybe `maven-deploy-plugin`? I forget, but apparently I was looking for _something_ that these projects don't declare as a plugin. (They haven't need to declare the plugin because they were inheriting it from `oss-parent`.)

Then this seemed like a good time to finally migrate the rest of our projects off `oss-parent`. See previous changes like cl/350197931. I've made the same changes here.

I've marginally improved upon both the CLs I mentioned before:
- I omit `<groupId>org.apache.maven.plugins</groupId>`, since that is the default.
- I omit `<publishingServerId>central</publishingServerId>`, since that is the default.

Also, I was careful not to copy `<failOnError>false</failOnError>` from `auto/value` and `auto/factory`. We don't seem to use it in our other projects, and it wasn't part of `oss-parent`.

Also, I omitted a `maven-javadoc-plugin` entry in `guava_beta_checker`, which already configured that plugin.

I could totally believe that some part of this CL will break a release somewhere. I'm not sure we'll notice until we try to publish a release. But that would be only a lateral move from where we likely are now, since we already can't publish a release until we perform the OSSRH->Central migration.

I could also totally believe that we could do things better here. Possible examples include:
- Move at least `maven-source-plugin` and `maven-javadoc-plugin` out of the release profile and into the main configuration (similar to `maven-javadoc-plugin` in `guava_beta_checker`). Or, alternatively, remove them entirely. (But removing them might cause Maven to select whatever the latest release is, and that's not great. It might also use slightly different settings that we've chosen; I'm not sure.)
- Omit the `sonatype-nexus-snapshots` configuration from projects that we don't publish snapshots for.
- Write our own common parent POM, as we've contemplated before.

RELNOTES=n/a
PiperOrigin-RevId: 788519238

Author: cpovirk

pom.xml

@@ -1,12 +1,6 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
 
-  <parent>
-    <groupId>org.sonatype.oss</groupId>
-    <artifactId>oss-parent</artifactId>
-    <version>7</version>
-  </parent>
-
   <groupId>com.google.testing.compile</groupId>
   <artifactId>compile-testing</artifactId>
   <version>HEAD-SNAPSHOT</version>
@@ -46,6 +40,13 @@
     <tag>HEAD</tag>
   </scm>
 
+  <distributionManagement>
+    <snapshotRepository>
+      <id>sonatype-nexus-snapshots</id>
+      <url>https://central.sonatype.com/repository/maven-snapshots/</url>
+    </snapshotRepository>
+  </distributionManagement>
+
   <dependencies>
     <dependency>
       <groupId>junit</groupId>