[FEAT] Add Enterprise SCIM data sources (groups/users)

[vmvarela]

New data sources:

• github_enterprise_scim_groups — GET /scim/v2/enterprises/{enterprise}/Groups (auto-paginates to fetch all results)
• github_enterprise_scim_group — GET /scim/v2/enterprises/{enterprise}/Groups/{scim_group_id}
• github_enterprise_scim_users — GET /scim/v2/enterprises/{enterprise}/Users (auto-paginates to fetch all results)
• github_enterprise_scim_user — GET /scim/v2/enterprises/{enterprise}/Users/{scim_user_id}

Shared helper/types in util_enterprise_scim.go:

• SCIM request builder + Accept: application/scim+json
• SCIM list pagination loop using startIndex/count (exposed as results_per_page, fetch-all by default)
• Full-fidelity flattening for groups/users (meta, members, emails, roles, name, etc.)

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Before the change?

• No support for reading enterprise SCIM entities

After the change?

• Implements: enterprise SCIM read data sources for Groups/Users (list + get).

Pull request checklist

• Schema migrations have been created if needed (example)
• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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[github-actions]

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[Copilot]

Pull request overview

This PR adds comprehensive SCIM (System for Cross-domain Identity Management) data source support for GitHub Enterprise, enabling users to query provisioned groups and users through Terraform.

• Implements four new data sources for enterprise SCIM groups and users (list and individual retrieval)
• Adds shared utility functions for SCIM API interactions with automatic pagination support
• Includes comprehensive test coverage and documentation for all new data sources

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
github/provider.go	Registers the four new SCIM data sources in the provider
github/util_enterprise_scim.go	Implements shared SCIM utilities including pagination, request building, and data flattening functions
github/data_source_github_enterprise_scim_groups.go	Data source for listing all SCIM groups with filtering and pagination support
github/data_source_github_enterprise_scim_group.go	Data source for retrieving a single SCIM group by ID
github/data_source_github_enterprise_scim_users.go	Data source for listing all SCIM users with filtering and pagination support
github/data_source_github_enterprise_scim_user.go	Data source for retrieving a single SCIM user by ID
github/data_source_github_enterprise_scim_groups_test.go	Unit tests for groups listing with multi-page pagination
github/data_source_github_enterprise_scim_group_test.go	Unit tests for individual group retrieval
github/data_source_github_enterprise_scim_users_test.go	Unit tests for users listing with filtering and pagination
github/data_source_github_enterprise_scim_user_test.go	Unit tests for individual user retrieval
website/docs/d/enterprise_scim_groups.html.markdown	Documentation for the SCIM groups listing data source
website/docs/d/enterprise_scim_group.html.markdown	Documentation for the single SCIM group data source
website/docs/d/enterprise_scim_users.html.markdown	Documentation for the SCIM users listing data source
website/docs/d/enterprise_scim_user.html.markdown	Documentation for the single SCIM user data source

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