fix: improve groupid extraction for Jenkins plugins

Consider the `Group-Id` java manifest property as this is typically set
for Jenkins plugins if there is no pom file

Signed-off-by: Weston Steimel <commits@weston.slmail.me>

syft/pkg/cataloger/internal/cpegenerate/java.go

@@ -23,6 +23,7 @@ var (
 	}
 
 	PrimaryJavaManifestGroupIDFields = []string{
+		"Group-Id",
 		"Bundle-SymbolicName",
 		"Extension-Name",
 		"Specification-Vendor",

syft/pkg/cataloger/java/archive_parser.go

@@ -147,9 +147,15 @@ func (j *archiveParser) parse(ctx context.Context) ([]pkg.Package, []artifact.Re
 		p := &pkgs[i]
 		if m, ok := p.Metadata.(pkg.JavaArchive); ok {
 			p.PURL = packageURL(p.Name, p.Version, m)
+
+			if strings.Contains(p.PURL, "io.jenkins.plugins") || strings.Contains(p.PURL, "org.jenkins-ci.plugins") {
+				p.Type = pkg.JenkinsPluginPkg
+			}
+
 		} else {
 			log.WithFields("package", p.String()).Warn("unable to extract java metadata to generate purl")
 		}
+
 		p.SetID()
 	}