Add tests and implement StubBearer authentication for Signer endpoints

- Created SignerEndpointsTests to validate the SignDsse and VerifyReferrers endpoints.
- Implemented StubBearerAuthenticationDefaults and StubBearerAuthenticationHandler for token-based authentication.
- Developed ConcelierExporterClient for managing Trivy DB settings and export operations.
- Added TrivyDbSettingsPageComponent for UI interactions with Trivy DB settings, including form handling and export triggering.
- Implemented styles and HTML structure for Trivy DB settings page.
- Created NotifySmokeCheck tool for validating Redis event streams and Notify deliveries.

plugins/notify/webhook/notify-plugin.json

@@ -0,0 +1,18 @@
+{
+  "schemaVersion": "1.0",
+  "id": "stellaops.notify.connector.webhook",
+  "displayName": "StellaOps Webhook Notify Connector",
+  "version": "0.1.0-alpha",
+  "requiresRestart": true,
+  "entryPoint": {
+    "type": "dotnet",
+    "assembly": "StellaOps.Notify.Connectors.Webhook.dll"
+  },
+  "capabilities": [
+    "notify-connector",
+    "webhook"
+  ],
+  "metadata": {
+    "org.stellaops.notify.channel.type": "webhook"
+  }
+}