fix(Maven): Do not duplicate hints about auto-generated POMs

For multi-module Maven projects, the hint about an auto-generated POM
was generated for each project. This is because the dependency graph
builder is shared by all projects, and packages are aggregated. To
prevent this, inspect only newly added packages. The hint is then
added only once for the project that referenced the package for the
first time.

Signed-off-by: Oliver Heger <oliver.heger@bosch.io>

Author: oheger-bosch

plugins/package-managers/maven/src/main/kotlin/Maven.kt

@@ -107,6 +107,7 @@ class Maven(
         val projectBuildingResult = mavenSupport.buildMavenProject(definitionFile)
         val mavenProject = projectBuildingResult.project
         val projectId = mavenProject.identifier(projectType)
+        val knownPackages = graphBuilder.packages()
 
         // If running in SBT mode expect that POM files were generated in a "target" subdirectory and that the correct
         // project directory is the parent directory of this.
@@ -129,7 +130,7 @@ class Maven(
             graphBuilder.scopesFor(projectId)
         )
 
-        val issues = graphBuilder.packages().mapNotNull { pkg ->
+        val issues = (graphBuilder.packages() - knownPackages).mapNotNull { pkg ->
             if (pkg.description == "POM was created by Sonatype Nexus") {
                 createAndLogIssue(
                     managerName,