repo-tools: make api extraction ignore packages without a role

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

.changeset/rare-berries-give.md

@@ -0,0 +1,5 @@
+---
+'@backstage/repo-tools': patch
+---
+
+Packages without a declared `backstage.role` are now ignored.

packages/repo-tools/src/commands/api-reports/api-extractor.ts

@@ -1107,7 +1107,7 @@ export async function categorizePackageDirs(packageDirs: any[]) {
             });
           const role = pkgJson?.backstage?.role;
           if (!role) {
-            throw new Error(`No backstage.role in ${dir}/package.json`);
+            return; // Ignore packages without roles
           }
           if (role === 'cli') {
             cliPackageDirs.push(dir);