fix: writes coverage report only when coverageConfig.report is true

Author: manolakis

.changeset/afraid-mugs-sing.md

@@ -0,0 +1,5 @@
+---
+'@web/test-runner-core': patch
+---
+
+Checks the flag report to see if the report needs to be generated

packages/test-runner-core/src/cli/TestRunnerCli.ts

@@ -369,7 +369,9 @@ export class TestRunnerCli {
   }
 
   private writeCoverageReport(testCoverage: TestCoverage) {
-    writeCoverageReport(testCoverage, this.config.coverageConfig);
+    if (this.config.coverageConfig.report) {
+      writeCoverageReport(testCoverage, this.config.coverageConfig);
+    }
   }
 
   private switchMenu(menu: MenuType) {