fix(object): allow literal underscore in RBAC resource names when parsing inventory IDs

[SAY-5]

RBAC resource names may contain a literal underscore (for example roles_ops), but ParseObjMetadata rejected such inventory identifiers with a "too many fields" error. The extra-fields check is now skipped for RBAC group kinds, where the remaining segment is unambiguously the name. Closes #487.

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