build(test-django-rest-framework-streaming): Migrate to uv and pyproject.toml

[ericapisani]

Summary

• Replace pip/requirements.txt with uv/pyproject.toml for dependency management
• Update run.sh to use uv run instead of manual venv creation and pip install
• Remove legacy requirements.txt

Refs PY-2444

Test plan

• Verify pyproject.toml includes all dependencies from the original requirements.txt
• Verify run.sh uses uv run
• Verify requirements.txt is removed

🤖 Generated with Claude Code

[linear-code]

PY-2444

[sentry]

Bug: The pyproject.toml requires Python >=3.12, but the .python-version file is pinned to 3.11. This conflict will cause uv to fail, preventing the app from starting.
_{Severity: CRITICAL}

Suggested Fix

Align the Python version requirements. Either update the .python-version file to a version that satisfies >=3.12 (e.g., 3.12), or adjust the requires-python constraint in pyproject.toml to ">=3.11" to match the existing environment.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent. Verify if this is a real issue. If it is, propose a fix; if not, explain why it's
not valid.

Location: test-django-rest-framework-streaming/pyproject.toml#L4

Potential issue: The `pyproject.toml` file specifies `requires-python = ">=3.12"`, while
the existing `.python-version` file in the same directory pins the Python version to
`3.11`. When the `run.sh` script executes `uv run gunicorn mysite.wsgi:application`, the
`uv` tool will detect this version incompatibility and exit with an error. Because
`run.sh` is configured with `set -euo pipefail`, the script will terminate immediately
upon this error, preventing the Gunicorn server from ever launching and the application
from starting.

_{Did we get this right? 👍 / 👎 to inform future reviews.}