Fix IDL attribute spacing inconsistencies in SaveImage and ExportContainer

[Copilot]

Summary of the Pull Request

Addresses code review feedback on #14121 by fixing inconsistent spacing in IDL attribute declarations for SaveImage and ExportContainer methods.

PR Checklist

• Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• Tests: Added/updated if needed and all pass
• Localization: All end user facing strings can be localized
• Dev docs: Added/updated if needed
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

The SaveImage and ExportContainer method declarations in wslaservice.idl used inconsistent spacing in their attribute declarations and pointer types, deviating from the file's established conventions.

Changes:

• [ in, unique ] IProgressCallback * ProgressCallback → [in, unique] IProgressCallback* ProgressCallback
• [in,out,unique] WSLA_ERROR_INFO * ErrorInfo → [in, out, unique] WSLA_ERROR_INFO* ErrorInfo

Both declarations now match the compact spacing style used by all other methods in the interface:

• No spaces inside attribute brackets
• Asterisk adjacent to type name
• Spaces after commas in attribute lists

Validation Steps Performed

Verified spacing consistency by comparing with existing method declarations (PullImage, LoadImage, ImportImage) that use the same parameter types.

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