Fix E2E test reporting message for webhook (#29304)

* Fix testcases failing  Webpack compilation
* Fix E2E test report message for webhook
* Demote more unstable tests
* Fix playwright reporting message, better test demotion

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Co-authored-by: Mattermost Build <build@mattermost.com>

e2e-tests/playwright/report.webhookgen.js

@@ -13,7 +13,7 @@ const summaryFile = 'results/summary.json';
 const results = JSON.parse(fs.readFileSync(resultsFile, 'utf8'));
 const summary = JSON.parse(fs.readFileSync(summaryFile, 'utf8'));
 const passRate = summary.passed / (summary.passed + summary.failed);
-const totalSpecs = summary.passed + summary.failed + summary.failed_expected;
+const totalSpecs = summary.passed + summary.failed;
 const playwrightVersion = results.config.version;
 const playwrightDuration = dayjs.duration(results.stats.duration, 'seconds').format('HH:mm:ss');