replace manual venv removal with remove_virtualenv #1318

Job	Run time
plan	2s
build uv	7m 33s
build debian:bookworm-slim,bookworm-slim,debian-slim	1m 7s
build alpine:3.21,alpine3.21,alpine	26s
build python:3.13-alpine,python3.13-alpine	1m 13s
build python:3.14-rc-alpine,python3.14-rc-alpine	1m 8s
build buildpack-deps:bookworm,bookworm,debian	1m 14s
build python:3.12-alpine,python3.12-alpine	1m 3s
build python:3.8-alpine,python3.8-alpine	1m 12s
build python:3.11-bookworm,python3.11-bookworm	1m 12s
build python:3.11-alpine,python3.11-alpine	1m 7s
build python:3.10-bookworm,python3.10-bookworm	1m 8s
build python:3.14-rc-bookworm,python3.14-rc-bookworm	1m 13s
build python:3.9-alpine,python3.9-alpine	1m 14s
build python:3.14-rc-slim-bookworm,python3.14-rc-bookworm-slim	1m 12s
build python:3.9-bookworm,python3.9-bookworm	1m 11s
build python:3.9-slim-bookworm,python3.9-bookworm-slim	1m 8s
build python:3.10-slim-bookworm,python3.10-bookworm-slim	1m 12s
build python:3.12-slim-bookworm,python3.12-bookworm-slim	1m 12s
build python:3.13-bookworm,python3.13-bookworm	1m 15s
build python:3.8-slim-bookworm,python3.8-bookworm-slim	1m 12s
build python:3.13-slim-bookworm,python3.13-bookworm-slim	1m 6s
build python:3.10-alpine,python3.10-alpine	1m 7s
build python:3.11-slim-bookworm,python3.11-bookworm-slim	1m 8s
build python:3.12-bookworm,python3.12-bookworm	1m 12s
build python:3.8-bookworm,python3.8-bookworm	1m 8s
annotate uv	-1s
	34m 54s

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