test: migrate standard databases to MCP integration endpoints

[anubhav756]

Overview

This PR migrates integration tests for standard operational and analytical databases from using explicit REST API layouts to native MCP endpoints.

Changes

• Transitioned tests for over 25+ database platforms (PostgreSQL, MySQL, AlloyDB, Spanner, Redis, etc.) to leverage the newly built MCP test framework functions.
• Resolved a bug inside SQL tool implementations that caused the MCP tools/list protocol schema to omit required template execution parameters by correctly returning mapped parameters via GetParameters().
• Adjusted generic HTTP assertions to support deep evaluation of MCP JSON-RPC response structures and embedded error codes (like -32603).

Note

This PR is Part 2 of 5 to migrate legacy endpoints to MCP endpoints.
(Base PR: #2711)

[github-actions]

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Summary

Status	Count
🔍 Total	44
✅ Successful	38
⏳ Timeouts	0
👻 Excluded	0
❓ Unknown	0
🚫 Errors	1
⛔ Unsupported	0

Errors per input

Errors in DEVELOPER.md

• [ERROR] https://play.dgraph.io/ | Network error: Connection failed. Check network connectivity and firewall settings (error sending request for url (https://play.dgraph.io/)): Connection failed. Check network connectivity and firewall settings

Full Github Actions output

[gemini-code-assist]

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