fix: enforce maven-enforcer-plugin 3.6.3 in release profile and fix POM structure (GoogleCloudPlatform#394)

* build: fix duplicate pluginManagement tag in functions-framework-api

In functions-framework-api/pom.xml, an existing pluginManagement block at line 130 caused duplicate tag parse errors when adding maven-enforcer-plugin:3.6.3.

This merges the maven-enforcer-plugin configuration into the single existing pluginManagement block, ensuring valid POM XML structure.

Change-Id: Iaf22b3348ecd9cbbd42f0ed995e2ce5e1831a4f6

* build: enforce maven-enforcer-plugin 3.6.3 in sonatype-oss-release profile

When release builds activate the sonatype-oss-release profile inherited from oss-parent:9, Maven executes maven-enforcer-plugin:1.2 declared in the parent profile's plugins block, overriding root-level pluginManagement.

This explicitly declares maven-enforcer-plugin:3.6.3 inside the sonatype-oss-release profile across all modules, guaranteeing modern plugin execution during automated release builds.

Change-Id: I410f36f6f53309388dcdef52a53131367b2cb165

---------

Co-authored-by: Anshul Patni <anshulpatni@google.com>

Author: AnshulPatni

function-maven-plugin/pom.xml

@@ -130,6 +130,11 @@
       <id>sonatype-oss-release</id>
       <build>
         <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-enforcer-plugin</artifactId>
+            <version>3.6.3</version>
+          </plugin>
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-source-plugin</artifactId>

functions-framework-api/pom.xml

@@ -75,15 +75,6 @@
   </dependencies>
 
   <build>
-    <pluginManagement>
-      <plugins>
-        <plugin>
-          <groupId>org.apache.maven.plugins</groupId>
-          <artifactId>maven-enforcer-plugin</artifactId>
-          <version>3.6.3</version>
-        </plugin>
-      </plugins>
-    </pluginManagement>
     <plugins>
       <plugin>
         <artifactId>maven-compiler-plugin</artifactId>
@@ -129,6 +120,11 @@
     </plugins>
     <pluginManagement>
       <plugins>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-enforcer-plugin</artifactId>
+          <version>3.6.3</version>
+        </plugin>
         <plugin>
           <artifactId>maven-javadoc-plugin</artifactId>
           <version>${maven-javadoc-plugin.version}</version>
@@ -163,6 +159,11 @@
       <id>sonatype-oss-release</id>
       <build>
         <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-enforcer-plugin</artifactId>
+            <version>3.6.3</version>
+          </plugin>
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-source-plugin</artifactId>

invoker/pom.xml

@@ -98,6 +98,11 @@
       <id>sonatype-oss-release</id>
       <build>
         <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-enforcer-plugin</artifactId>
+            <version>3.6.3</version>
+          </plugin>
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-source-plugin</artifactId>