Add MergeUsageAnalyzer to detect legacy merge service usage

- Implemented MergeUsageAnalyzer to flag usage of AdvisoryMergeService and AddMergeModule.
- Created AnalyzerReleases.Shipped.md and AnalyzerReleases.Unshipped.md for release documentation.
- Added tests for MergeUsageAnalyzer to ensure correct diagnostics for various scenarios.
- Updated project files for analyzers and tests to include necessary dependencies and configurations.
- Introduced a sample report structure for scanner output.

src/Concelier/__Tests/StellaOps.Concelier.WebService.Tests/WebServiceEndpointsTests.cs

@@ -1183,19 +1183,19 @@ public sealed class WebServiceEndpointsTests : IAsyncLifetime
             },
             Linkset = new AdvisoryObservationLinksetDocument
             {
-                Aliases = aliases?.Select(value => value.Trim().ToLowerInvariant()).ToList(),
-                Purls = purls?.Select(value => value.Trim()).ToList(),
-                Cpes = cpes?.Select(value => value.Trim()).ToList(),
-                References = references is null
-                    ? new List<AdvisoryObservationReferenceDocument>()
-                    : references
-                        .Select(reference => new AdvisoryObservationReferenceDocument
-                        {
-                            Type = reference.Type.Trim().ToLowerInvariant(),
-                            Url = reference.Url.Trim()
-                        })
-                        .ToList()
-            },
+                Aliases = aliases?.Where(value => value is not null).ToList(),
+                Purls = purls?.Where(value => value is not null).ToList(),
+                Cpes = cpes?.Where(value => value is not null).ToList(),
+                References = references is null
+                    ? new List<AdvisoryObservationReferenceDocument>()
+                    : references
+                        .Select(reference => new AdvisoryObservationReferenceDocument
+                        {
+                            Type = reference.Type,
+                            Url = reference.Url
+                        })
+                        .ToList()
+            },
             Attributes = new Dictionary<string, string>(StringComparer.Ordinal)
         };
     }