chore(sonar)!: pluralize unused [Flags] enums (S2342)

S2342 requires [Flags] enums to use plural names. Both enums have zero
references anywhere in the repo today.

- ConstraintType -> ConstraintTypes
- TriggerType    -> TriggerTypes

BREAKING CHANGE: external NuGet consumers (if any) referencing these
singular-named types will need to update to the plural names. Internal
codebase has no references.

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

src/Strata.SqlTools.SqlBreakdown/Enums/SQL/ConstraintTypes.cs

@@ -4,7 +4,7 @@ namespace Strata.SqlTools.SqlBreakdown.Enums.SQL;
 /// Specifies the type of SQL constraint.
 /// </summary>
 [Flags]
-public enum ConstraintType
+public enum ConstraintTypes
 {
     /// <summary>
     /// Default value constraint.
@@ -36,4 +36,3 @@ public enum ConstraintType
     /// </summary>
     All = 31
 }
-

src/Strata.SqlTools.SqlBreakdown/Enums/SQL/TriggerTypes.cs

@@ -4,7 +4,7 @@ namespace Strata.SqlTools.SqlBreakdown.Enums.SQL;
 /// Specifies the type of SQL trigger.
 /// </summary>
 [Flags]
-public enum TriggerType
+public enum TriggerTypes
 {
     /// <summary>
     /// Trigger fires after the action.
@@ -21,4 +21,3 @@ public enum TriggerType
     /// </summary>
     Both = 3
 }
-