chore(sonar): apply collection-expression syntax across all sites (IDE0028)

Manual sweep of all 42 IDE0028 sites flagged by SonarQube — `dotnet format
analyzers --diagnostics IDE0028` declined to fix these (no .editorconfig
opt-in for `dotnet_style_prefer_collection_expression`), so applied by
hand. The repo already targets `<LangVersion>latest</LangVersion>` on
net8.0, so C# 12 collection expressions are available.

Pattern: `new List<T>()` / `new Dictionary<K,V>()` / `new ArrayList()` /
`new()` -> `[]` for empty; `new List<T> { ... }` -> `[...]` for literal.

24 files touched in src/{EFCore, LinqToSql, Query, Snowflake, SqlBreakdown,
SqlServer}; tests untouched (no IDE0028 sites in test code).

Build clean (35 warnings unchanged from baseline, 0 errors). All tests
remain green.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/Strata.SqlTools.SqlBreakdown/Utilities/SqlSchemaHelpers.cs

@@ -61,8 +61,8 @@ public static partial class SqlUtils
     /// </summary>
     /// <returns>A list of system schema names.</returns>
     public static List<string> GetSystemSchemas()
-        => new List<string>
-        {
+        =>
+        [
             DEFAULT_SCHEMA,
             "int",      // integration
             "perf",
@@ -73,6 +73,6 @@ public static partial class SqlUtils
             "upg",
             "irc",      // irc chat rooms
             "migration"
-        };
+        ];
 }