Remove nexus-release-plugin

Because it apparently doesn't work with the new Quarkiverse release
workflow.

It also no longer makes sense, TBH, since Quarkiverse releases implement
their own staging mechanism.

pom.xml

@@ -123,39 +123,6 @@
                 </plugin>
             </plugins>
         </pluginManagement>
-        <plugins>
-            <!-- Skip the deploy plugin explicitly: we use nexus-staging-maven-plugin instead -->
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-deploy-plugin</artifactId>
-                <configuration>
-                    <skip>true</skip>
-                </configuration>
-            </plugin>
-            <!--
-                       Configure the nexus-staging-maven-plugin explicitly (without <extension>true</extension>)
-                       in order to work around a problem in the "release" module (see that module's POM for more info).
-                   -->
-            <plugin>
-                <groupId>org.sonatype.plugins</groupId>
-                <artifactId>nexus-staging-maven-plugin</artifactId>
-                <!-- This is essential: do not put true here -->
-                <extensions>false</extensions>
-                <executions>
-                    <execution>
-                        <id>default-deploy</id>
-                        <phase>deploy</phase>
-                        <goals>
-                            <!--
-                                              This will only put artifacts in a staging directory.
-                                              See the "release" module for actual deployment, at the end of the build.
-                                           -->
-                            <goal>deploy</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
-        </plugins>
     </build>
     <profiles>
         <!-- The profiles `skippingAllTests` and `skippingIntegrationTests` are currently duplicates,
@@ -208,22 +175,5 @@
                 <docker.skip>true</docker.skip>
             </properties>
         </profile>
-        <!--
-                 WARNING: this MUST be the very last profile,
-                 so that the "release" module is the very last module,
-                 in particular when deploying artifacts to a Nexus repository.
-                 See the "release" module POM for more information.
-             -->
-        <profile>
-            <id>release</id>
-            <activation>
-                <property>
-                    <name>performRelease</name>
-                </property>
-            </activation>
-            <modules>
-                <module>release</module>
-            </modules>
-        </profile>
     </profiles>
 </project>