Fix missing MCP test

[Copilot]

Why make this change?

• Closes Refine Service.Tests changes for MCP #2874
• Test for validating endpoint availability needed to be extended to cover MCP endpoints alongside existing REST and GraphQL tests. The original attempt failed due to MCP server not being ready in time.

What is this change?

• Extended test parameters to include MCP endpoint testing with REST and GraphQL
• Added GetMcpResponsePostConfigHydration helper method with retry logic to handle MCP server initialization timing
• Used Task.Delay() instead of Thread.Sleep() for async-friendly waiting
• Sourced endpoint paths from runtime options (RestRuntimeOptions, GraphQLRuntimeOptions, McpRuntimeOptions) instead of hardcoded strings
• Fixed display names to accurately reflect test scenarios (e.g., "disabled" vs "enabled")

How was this tested?

• Integration Tests
• Unit Tests

Sample Request(s)

N/A - Internal test infrastructure change

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