build(test-multiprocessing): Migrate to uv and pyproject.toml

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.

Refs PY-2465
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ericapisani

test-multiprocessing/pyproject.toml

@@ -0,0 +1,12 @@
+[project]
+name = "test-multiprocessing"
+version = "0"
+requires-python = ">=3.12"
+
+dependencies = [
+    "ipdb>=0.13.13",
+    "sentry-sdk",
+]
+
+[tool.uv.sources]
+sentry-sdk = { path = "../../sentry-python", editable = true }

test-multiprocessing/requirements.txt

@@ -1,12 +1,9 @@
 #!/usr/bin/env bash
-
 set -euo pipefail
-
 reset
 
-python -m venv .venv
-source .venv/bin/activate
-
-pip install -r requirements.txt
+if ! command -v uv &> /dev/null; then
+    curl -LsSf https://astral.sh/uv/install.sh | sh
+fi
 
-python main.py
+uv run python main.py