Restore original errorprone-jdk25 profile structure

The previous fix incorrectly split the errorprone-jdk25 profile into
errorprone-jdk21 ([21,)) and errorprone-jdk25 ([25,)). Error Prone 2.48.0
requires JDK 25+ (not just 21+), causing compilation failures on JDK 21.

Restore the single errorprone-jdk25 profile with [25,) activation that
includes Error Prone 2.48.0, NullAway 0.13.1, and --should-stop=ifError=FLOW,
matching the original main branch structure.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Ubuntu

pom.xml

@@ -483,16 +483,19 @@
 
     <profiles>
         <profile>
-            <id>errorprone-jdk21</id>
+            <id>errorprone-jdk25</id>
             <activation>
-                <jdk>[21,)</jdk>
+                <jdk>[25,)</jdk>
             </activation>
             <build>
                 <plugins>
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>
                         <artifactId>maven-compiler-plugin</artifactId>
                         <configuration>
+                            <compilerArgs combine.children="append">
+                                <arg>--should-stop=ifError=FLOW</arg>
+                            </compilerArgs>
                             <annotationProcessorPaths combine.self="override">
                                 <path>
                                     <groupId>com.google.errorprone</groupId>
@@ -510,24 +513,5 @@
                 </plugins>
             </build>
         </profile>
-        <profile>
-            <id>errorprone-jdk25</id>
-            <activation>
-                <jdk>[25,)</jdk>
-            </activation>
-            <build>
-                <plugins>
-                    <plugin>
-                        <groupId>org.apache.maven.plugins</groupId>
-                        <artifactId>maven-compiler-plugin</artifactId>
-                        <configuration>
-                            <compilerArgs combine.children="append">
-                                <arg>--should-stop=ifError=FLOW</arg>
-                            </compilerArgs>
-                        </configuration>
-                    </plugin>
-                </plugins>
-            </build>
-        </profile>
     </profiles>
 </project>