Add Cosmos DB container copy job MCP tools

[niteshvijay1995]

Summary

Adds 7 new MCP tools for managing Cosmos DB container copy jobs via the ARM copyJobs REST API (\�pi-version 2025-05-01-preview).

New Tools

Tool	Description
\create_copy_job\	Create a copy job (NoSQL, Cassandra, Mongo, Blob backup/restore)
\get_copy_job\	Get job status and details
\list_copy_jobs\	List all copy jobs for the account
\cancel_copy_job\	Cancel a running job
\pause_copy_job\	Pause a running job
\
esume_copy_job\	Resume a paused job
\complete_copy_job\	Complete an Online copy job (flush remaining changes)

Implementation Details

• **\CopyJobService**: New service class making ARM REST calls using \DefaultAzureCredential\ and \IHttpClientFactory\
• Auto-discovers account resource ID from \COSMOS_ENDPOINT\ env var + subscription ID parameter
• Supports all copy job types: \NoSqlRUToNoSqlRU, \CassandraRUToCassandraRU, \MongoRUToMongoRU, \MongoRUToMongoVCore, \CassandraRUToAzureBlobStorage, \AzureBlobStorageToCassandraRU\
• Follows existing codebase patterns (tool registration in MCPProtocolController, scoped DI)

Files Changed

• New: \Services/CopyJobService.cs\ — ARM REST service
• New: \Tests/CopyJobServiceTests.cs\ — 9 unit tests for parameter validation
• Modified: \Controllers/MCPProtocolController.cs\ — Tool registration + dispatch
• Modified: \Program.cs\ — DI registration

Testing

• All 16 tests pass (7 existing + 9 new)
• Build succeeds with 0 warnings, 0 errors

[sajeetharan]

This PR adds seven new MCP tools, but the user-facing docs were not updated. The tool list here still only documents the original Cosmos data-plane tools and does not mention the new copy-job operations. Since these new tools use the ARM management plane, the docs should also call out the new input and permission model: subscriptionId is required, the account is resolved from COSMOS_ENDPOINT, and the caller needs ARM/RBAC access to list Cosmos accounts and manage copy jobs. Without that, the feature will be difficult to discover and configure correctly.

Update the instructions accordingly

@jcodella WDYT? these tools should go to Azure MCP server? also please review the PR