Replace the scattered per-folder requirements*.txt files and the OS-scanning find-python3.sh bootstrap with:

• A single root pyproject.toml + uv.lock for the whole repo, structured as a uv workspace
• Per-tool dependencies declared as PEP 735 [dependency-groups] instead of individual requirements.txt files
• Dependabot pointed at the new uv ecosystem so it can bump versions automatically
• find-python3.sh deprecated and removed entirely, replaced by a small ensure_uv() helper: check uv on PATH, else python3 -m pip install --user uv, else error out recommending a DEVPROD ticket (examples: DEVPROD-13413, DEVPROD-19733). Venv creation moves to uv venv, direct script execution moves to uv run — no more filesystem scanning for a system Python anywhere
• uv tool install unchanged for the CLI packages (mongodl, mongosh-dl, socks5srv, drivers-orchestration)
• evergreen_config_generator/ is out of scope (unused).

Full design doc and rationale: gist

Subtasks:

• Replace find-python3.sh with ensure_uv(); switch direct script execution (download-mongodb.sh, serverless/create-instance.sh, atlas-utils.sh, happy_eyeballs/, tests/, setup.sh, install-cli.sh) to uv run
• Root workspace setup + Dependabot switch
• docker — venv + dependency group
• auth_aws — venv + dependency group
• auth_oidc — venv + dependency group
• ocsp — venv + dependency group
• csfle + csfle-legacy — venv + conflicting dependency groups
• csfle/azurekms — venv + dependency group; delete find-python3.sh/is_python3.py for good and remove the now-dead venvcreate helper

Each subtask should preserve the existing shell-script interface (venv names, activate-*.sh) and be validated against its own Evergreen task before merging, since this repo is consumed by other MongoDB driver repos' CI.