feat(api): add special handling for _mcp_servers file uploads and improve tests (#8847)

* update

* [autofix.ci] apply automated fixes

* refactor: update file query logic and enhance error logging in file deletion

* refactor: enhance error handling and improve code clarity in MCP server list retrieval

* refactor: improve type hinting and code clarity in MCP servers file tests

* fix: handle potential None value for server configuration file in async server list retrieval

* Update test_files.py

* fix: autofix.ci / Update Starter Projects (pull_request)

* chore: Add API key environment variables to CI workflows

* Updated .github/workflows/ci.yml and .github/workflows/python_test.yml to include OPENAI_API_KEY, ANTHROPIC_API_KEY, and other relevant API keys as environment variables for CI jobs.

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Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Gabriel Luiz Freitas Almeida <gabriel@langflow.org>
Co-authored-by: Lucas Oliveira <62335616+lucaseduoli@users.noreply.github.com>
Co-authored-by: Carlos Coelho <80289056+carlosrcoelho@users.noreply.github.com>
Co-authored-by: italojohnny <italojohnnydosanjos@gmail.com>