fix(dependency-dashboard): Don't create dependency dashboard during onboarding (#7453)

lib/workers/repository/dependency-dashboard.spec.ts

@@ -26,6 +26,7 @@ beforeEach(() => {
   config.platform = PLATFORM_TYPE_GITHUB;
   config.errors = [];
   config.warnings = [];
+  delete config.onboarding;
 });
 
 async function dryRun(

lib/workers/repository/dependency-dashboard.ts

@@ -55,6 +55,7 @@ export async function ensureMasterIssue(
   // legacy/migrated issue
   const reuseTitle = 'Update Dependencies (Renovate Bot)';
   if (
+    config.onboarding ||
     !(
       config.dependencyDashboard ||
       branches.some(