Fix IDE0028 style violation in SagaTestsConfiguration.cs

[Copilot]

NServiceBus Core 10.0.0-alpha.19 update introduced a code change that violated the project's strict IDE0028 style rules, causing build failures on both Linux and Windows CI.

Changes

• Replaced verbose collection initialization pattern with collection expression syntax in SagaTestsConfiguration.cs

// Before
field = new SagaMetadataCollection();
field.AddRange(SagaMetadata.CreateMany(sagaTypes));

// After
field = [.. SagaMetadata.CreateMany(sagaTypes)];

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[Copilot]

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