Add missing endpoints in general-request-handling

[bluepal-prasanthi-moparthi]

This PR includes the following general-request-handling- related endpoints:

1. GET - /_admin/version
2. GET - /_admin/status

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Note

Introduces _admin/version via new HandleAdminVersion and updates GetServerStatus to use global _admin/status when dbName is empty, with expanded tests and minor test robustness improvements.

• Backend/API:
  • Add HandleAdminVersion(opts) to fetch version via _admin/version (alias of _api/version).
  • Enhance GetServerStatus to support both _db/{db}/_admin/status and global _admin/status when dbName is empty.
• Tests:
  • Add Test_HandleAdminVersion (with/without options).
  • Expand Test_GetServerStatus to cover no DB, with DB, and invalid DB cases.
  • Improve access token tests: use UUID names, retry on 409 conflicts, add cleanup helper, extra nil checks.
• Docs:
  • Update v2/CHANGELOG.md to note general-request-handling endpoints.

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[Copilot]

Pull Request Overview

This PR adds missing general request handling endpoints to the ArangoDB Go driver v2, specifically implementing admin version and status endpoints. The implementation includes proper handling of both database-scoped and global admin requests.

• Added HandleAdminVersion method that provides an alias for GET /_admin/version with optional details
• Updated GetServerStatus to support both global (/_admin/status) and database-scoped (/_db/{name}/_admin/status) requests
• Added comprehensive test coverage for both new and updated functionality

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
v2/arangodb/client_server_info.go	Adds AdminVersionInfo struct and HandleAdminVersion interface method
v2/arangodb/client_server_info_impl.go	Implements HandleAdminVersion method with proper error handling
v2/arangodb/client_admin_impl.go	Updates GetServerStatus to handle empty dbName for global status requests
v2/tests/admin_test.go	Adds comprehensive tests for both HandleAdminVersion and updated GetServerStatus behavior
v2/CHANGELOG.md	Documents the addition of general-request-handling endpoints

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