feat: Implement vulnerability token signing and verification utilities

- Added VulnTokenSigner for signing JWT tokens with specified algorithms and keys.
- Introduced VulnTokenUtilities for resolving tenant and subject claims, and sanitizing context dictionaries.
- Created VulnTokenVerificationUtilities for parsing tokens, verifying signatures, and deserializing payloads.
- Developed VulnWorkflowAntiForgeryTokenIssuer for issuing anti-forgery tokens with configurable options.
- Implemented VulnWorkflowAntiForgeryTokenVerifier for verifying anti-forgery tokens and validating payloads.
- Added AuthorityVulnerabilityExplorerOptions to manage configuration for vulnerability explorer features.
- Included tests for FilesystemPackRunDispatcher to ensure proper job handling under egress policy restrictions.

NuGet.config

@@ -29,10 +29,7 @@
       <package pattern="Microsoft.IdentityModel.Abstractions" />
       <package pattern="Microsoft.AspNetCore.Authentication.JwtBearer" />
       <package pattern="Google.Protobuf" />
-      <package pattern="Grpc.*" />
-      <package pattern="Microsoft.Bcl.AsyncInterfaces" />
-      <package pattern="System.Memory" />
-      <package pattern="System.Runtime.CompilerServices.Unsafe" />
+      <package pattern="Grpc.*" />
     </packageSource>
     <packageSource key="dotnet-public">
       <package pattern="Microsoft.Extensions.*" />