feat: Document completed tasks across multiple components

- Added completed tasks documentation for Scheduler WebService, ImpactIndex, Models, Queue, Storage.Mongo, Worker, Signals, Signer, UI, Zastava.Observer, Zastava.Webhook, Zastava.Core, Cryptography.Kms, Cryptography, and Plugin.
- Each task includes ID, status, owners, dependencies, descriptions, and exit criteria to ensure clarity and traceability.
- Enhanced integration and unit testing coverage across various components to validate functionality and compliance with specifications.

docs/events/samples/scanner.event.report.ready@1.sample.json

@@ -45,12 +45,20 @@
       "digest": "digest-123",
       "revisionId": "rev-42"
     },
-  "links": {
-    "ui": "https://scanner.example/ui/reports/report-abc",
-    "report": "https://scanner.example/api/v1/reports/report-abc",
-    "policy": "https://scanner.example/api/v1/policy/revisions/rev-42",
-    "attestation": "https://scanner.example/ui/attestations/report-abc"
-  },
+  "links": {
+    "report": {
+      "ui": "https://scanner.example/ui/reports/report-abc",
+      "api": "https://scanner.example/api/v1/reports/report-abc"
+    },
+    "policy": {
+      "ui": "https://scanner.example/ui/policy/revisions/rev-42",
+      "api": "https://scanner.example/api/v1/policy/revisions/rev-42"
+    },
+    "attestation": {
+      "ui": "https://scanner.example/ui/attestations/report-abc",
+      "api": "https://scanner.example/api/v1/reports/report-abc/attestation"
+    }
+  },
     "dsse": {
       "payloadType": "application/vnd.stellaops.report+json",
       "payload": "eyJyZXBvcnRJZCI6InJlcG9ydC1hYmMiLCJpbWFnZURpZ2VzdCI6InNoYTI1NjpmZWVkZmFjZSIsImdlbmVyYXRlZEF0IjoiMjAyNS0xMC0xOVQxMjozNDo1NiswMDowMCIsInZlcmRpY3QiOiJibG9ja2VkIiwicG9saWN5Ijp7InJldmlzaW9uSWQiOiJyZXYtNDIiLCJkaWdlc3QiOiJkaWdlc3QtMTIzIn0sInN1bW1hcnkiOnsidG90YWwiOjEsImJsb2NrZWQiOjEsIndhcm5lZCI6MCwiaWdub3JlZCI6MCwicXVpZXRlZCI6MH0sInZlcmRpY3RzIjpbeyJmaW5kaW5nSWQiOiJmaW5kaW5nLTEiLCJzdGF0dXMiOiJCbG9ja2VkIiwic2NvcmUiOjQ3LjUsInNvdXJjZVRydXN0IjoiTlZEIiwicmVhY2hhYmlsaXR5IjoicnVudGltZSJ9XSwiaXNzdWVzIjpbXX0=",