Restore null-conditional operator for logger in WorkspaceOperations

[Copilot]

Addressed feedback from PR #59 regarding the removal of the null-conditional operator on logger.LogInformation() at line 205 in WorkspaceOperations.cs.

Changes

• Restored logger?.LogInformation(...) from logger.LogInformation(...) in UpdateDataChangeRequest method

While the logger is obtained via GetRequiredService<ILoggerFactory>() (guaranteeing non-null), the null-conditional operator maintains defensive programming consistency with the original implementation.

// Before (potentially unsafe)
logger.LogInformation("Applying changes to Data Stream {Stream}", stream.StreamIdentity);

// After (defensive)
logger?.LogInformation("Applying changes to Data Stream {Stream}", stream.StreamIdentity);

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