refactor(GitVersion.Configuration): if value assigned to BeforeString cannot be parsed, throw exception

WhenBadDateFormatShouldFail expects bad strings to cause an exception

Author: BinToss

src/GitVersion.Configuration/IgnoreConfiguration.cs

@@ -13,8 +13,7 @@ internal record IgnoreConfiguration : IIgnoreConfiguration
     public string? BeforeString
     {
         get => Before?.ToString("yyyy-MM-ddTHH:mm:ssZ");
-        // if TryParse returns false, Before = null and the parse error is suppressed. How should the user be informed of parse errors?
-        init => Before = value is null ? null : DateTimeOffset.TryParse(value, out DateTimeOffset dto) ? dto : null;
+        init => Before = value is null ? null : DateTimeOffset.Parse(value);
     }
 
     [JsonIgnore]