Add unit tests for VexLens normalizer, CPE parser, product mapper, and PURL parser

- Implemented comprehensive tests for VexLensNormalizer including format detection and normalization scenarios.
- Added tests for CpeParser covering CPE 2.3 and 2.2 formats, invalid inputs, and canonical key generation.
- Created tests for ProductMapper to validate parsing and matching logic across different strictness levels.
- Developed tests for PurlParser to ensure correct parsing of various PURL formats and validation of identifiers.
- Introduced stubs for Monaco editor and worker to facilitate testing in the web application.
- Updated project file for the test project to include necessary dependencies.

src/Web/StellaOps.Web/tsconfig.spec.json

@@ -1,14 +1,22 @@
 /* To learn more about this file see: https://angular.io/config/tsconfig. */
 {
   "extends": "./tsconfig.json",
-  "compilerOptions": {
-    "outDir": "./out-tsc/spec",
-    "types": [
-      "jasmine"
-    ]
-  },
-  "include": [
-    "src/**/*.spec.ts",
-    "src/**/*.d.ts"
-  ]
+  "compilerOptions": {
+    "outDir": "./out-tsc/spec",
+    "types": [
+      "jasmine"
+    ],
+    "paths": {
+      "monaco-editor/esm/vs/editor/editor.api": ["src/app/testing/monaco-stub"],
+      "monaco-editor/esm/vs/editor/editor.worker": ["src/app/testing/monaco-worker-stub"],
+      "monaco-editor/esm/vs/language/json/json.worker": ["src/app/testing/monaco-worker-stub"],
+      "monaco-editor/esm/vs/language/css/css.worker": ["src/app/testing/monaco-worker-stub"],
+      "monaco-editor/esm/vs/language/html/html.worker": ["src/app/testing/monaco-worker-stub"],
+      "monaco-editor/esm/vs/language/typescript/ts.worker": ["src/app/testing/monaco-worker-stub"]
+    }
+  },
+  "include": [
+    "src/**/*.spec.ts",
+    "src/**/*.d.ts"
+  ]
 }