feat(Tagging): regenerated services with latest API definition

[stefano-rm]

PR summary

Add optional message field to TagResultsItem interface to expose detailed error messages returned by the GhoST Tags API when tagging operations fail.

PR Checklist

• The commit message follows the Angular Commit Message Guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Current vs new behavior

Current behavior: When a tagging operation fails, the TagResultsItem only contains resource_id and is_error fields. Error details are not exposed to SDK users.

New behavior: The TagResultsItem now includes an optional message field that contains the error message returned by the API, providing better error diagnostics.

Does this PR introduce a breaking change?

• Yes
• No

Other information

• Related to (IBM) task #29830
• Changes are minimal: only adds the message?: string field to the interface
• The field is optional and backward compatible
• Swagger definition has been updated and merged in the ghost-for-resources repository