Pull request overview

This PR adds comprehensive support for GitHub Enterprise Cost Centers, enabling Terraform management of cost center resources and their assignments. The implementation addresses issue #2739 by leveraging the newly public GitHub Enterprise billing API.

Key changes:

• Introduces github_enterprise_cost_center resource for creating, updating, and archiving cost centers with authoritative management of user, organization, and repository assignments
• Adds github_enterprise_cost_center and github_enterprise_cost_centers data sources for querying cost center information
• Implements robust resource assignment synchronization with batching (50 resources per request) and retry logic for transient failures

Reviewed changes

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Half-way through. Please consider if my comments could apply to other places in your changes as well, I wasn't able to comment on every duplicate thing

Thank you for the thorough review @deiga! I've addressed all the feedback. Here's a summary of the changes:

Implemented:

• ✅ Added top-level Description attribute to all resources and data sources
• ✅ Removed ctx = context.WithValue(ctx, ctxId, ...) pattern from all files
• ✅ Replaced log.Printf with tflog.Info and added tflog.Warn for 404 removals
• ✅ Used diag.Errorf instead of diag.FromErr(fmt.Errorf(...))
• ✅ Create and Update no longer call Read - computed fields are set directly
• ✅ Extracted anonymous retry functions to named functions (retryCostCenterAddResources, retryCostCenterRemoveResources)
• ✅ Changed import ID separator from / to : and using parseTwoPartID
• ✅ Replaced stringSliceToAnySlice with existing flattenStringList
• ✅ Used http.StatusNotFound and other constants instead of magic numbers
• ✅ Moved is404 to util.go
• ✅ Updated tests to use providerFactories and skipUnlessEnterprise(t)
• ✅ Added owner = var.enterprise_slug to example provider config
• ✅ Used buildTwoPartID in data source
• ✅ Inlined check variables in tests

Regarding questions:

• The resources attribute provides the raw API view while users, organizations, repositories are filtered convenience attributes. I kept both for flexibility and debugging purposes.
• diffStringSlices differs from setChanges - it compares string slices directly while setChanges works with Terraform state changes. They serve different purposes.
• In Create, we only fetch from API after assignments are configured to populate computed fields, since we're not calling Read anymore.

All tests pass and the code compiles without errors.