Rename Apple Business 'Location' to 'Organization Unit' in UI and docs (#44833)
## Summary
- Renames Apple Business "Location" / "Locations" to "Organization Unit"
/ "Organization Units" across user-facing UI strings, documentation, and
code comments
- Updates the VPP table column header, modal text, error messages, audit
log descriptions, YAML configuration docs, and article guides
- Underlying API field names (`location` in JSON) and YAML config keys
remain unchanged for backward compatibility
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