test(fastmcp): Simulate stdio transport with memory streams

[alexander-alderman-webb]

Description

Stop mocking transport layer of mcp package in tests.

Issues

Reminders

• Please add tests to validate your changes, and lint your code using tox -e linters.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

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New Features ✨

• feat(span-streaming): Add experimental trace_lifecycle switch (1) by sentrivana in #5397

Bug Fixes 🐛

• fix(arq): handle settings_cls passed as keyword argument by nc9 in #5393
• fix(dramatiq): cleanup isolated scope and transaction when message is skipped by frankie567 in #5346
• fix(google-genai): deactivate google genai when langchain is used by shellmayr in #5389

Internal Changes 🔧

• test(fastmcp): Simulate stdio transport with memory streams by alexander-alderman-webb in #5333

• test(mcp): Simulate stdio transport with memory streams by alexander-alderman-webb in #5329
• ci: migration to the new codecov action by MathurAditya724 in #5392

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_{🤖 This preview updates automatically when you update the PR.}

[github-actions]

Codecov Results 📊

✅ 13 passed | Total: 13 | Pass Rate: 100% | Execution Time: 5.50s

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 13646 uncovered lines.

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