[CHORE] unpin fastapi, move to dev dependency

[jairad26]

Description of changes

Unpins fastapi and moves to dev dependency. only use of it is in python fastapi server.
#4243

Test plan

How are these changes tested?

• Tests pass locally with pytest for python, yarn test for js, cargo test for rust

Documentation Changes

Are all docstrings for user-facing APIs updated if required? Do we need to make documentation changes in the docs section?

[github-actions]

Reviewer Checklist

Please leverage this checklist to ensure your code review is thorough before approving

Testing, Bugs, Errors, Logs, Documentation

• Can you think of any use case in which the code does not behave as intended? Have they been tested?
• Can you think of any inputs or external events that could break the code? Is user input validated and safe? Have they been tested?
• If appropriate, are there adequate property based tests?
• If appropriate, are there adequate unit tests?
• Should any logging, debugging, tracing information be added or removed?
• Are error messages user-friendly?
• Have all documentation changes needed been made?
• Have all non-obvious changes been commented?

System Compatibility

• Are there any potential impacts on other parts of the system or backward compatibility?
• Does this change intersect with any items on our roadmap, and if so, is there a plan for fitting them together?

Quality

• Is this code of a unexpectedly high quality (Readability, Modularity, Intuitiveness)

[jairad26]

• [CHORE] clean up tests running against python impl #4708
• [CHORE] unpin fastapi, move to dev dependency #4706 👈 (View in Graphite)
• main

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[propel-code-bot]

This PR unpins the FastAPI version and relocates both fastapi and opentelemetry-instrumentation-fastapi from core dependencies to development dependencies. Corresponding changes are made to pyproject.toml, requirements.txt, and requirements_dev.txt to reflect this refactoring, making FastAPI only available in dev and local development environments.

This summary was automatically generated by @propel-code-bot

[propel-code-bot]

[ArchitectureDecision]

Moving fastapi from dependencies to optional-dependencies suggests making it a development-only dependency. However, based on the imports in the project (like opentelemetry-instrumentation-fastapi), FastAPI appears to be a runtime dependency for the main package functionality. You may want to keep a minimum version of FastAPI in the main dependencies while providing the specific version in dev dependencies for testing purposes.