chore(sonar): prefer TryGetValue over ContainsKey+indexer (CA1854)

Applied via `dotnet format analyzers --diagnostics CA1854 --severity info`.
Eliminates the duplicate hash lookup in the
`if (d.ContainsKey(k)) d[k]++ else d[k] = 1` pattern. The fixer rewrites
the conditional to `if (d.TryGetValue(k, out var value)) d[k] = ++value;`
which is semantically identical but does the lookup once.

4 files touched.

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

src/Strata.SqlTools.SqlBreakdown/Expressions/InputPropertyExpression.cs

@@ -271,15 +271,13 @@ public static class FlatDataUtils
     {
         ArgumentNullException.ThrowIfNull(data);
 
-        if (!data.ContainsKey(key))
+        if (!data.TryGetValue(key, out object? rawValue))
         {
             throw new ArgumentException(
                 $"The specified key is not available. Requested key: [{key}] Available keys: [{string.Join(", ", data.Keys)}]",
                 nameof(key));
         }
 
-        var rawValue = data[key];
-
         return rawValue;
     }