refactor(ansible): rename internal playbooks to install_* prefix

[xmfcx]

• Parent Issue: Simplify ansible entrypoints: rename playbooks and drop setup-dev-env.sh #7052
• Renames three internal-only playbooks under ansible/playbooks/ to the install_* convention: autoware_requirements.yaml → install_image_deps.yaml, nvidia.yaml → install_nvidia.yaml, rmw.yaml → install_rmw.yaml.
• Updates all 11 Dockerfile references in lockstep across core.Dockerfile, universe.Dockerfile, universe-cuda.Dockerfile, base.Dockerfile, base-cuda.Dockerfile — both ansible-playbook autoware.dev_env.<name> call sites and the narrow --mount=type=bind paths for nvidia.yaml / rmw.yaml.

Why

Phase 1 internal rename pass for the ansible entrypoint consolidation tracked in #7052. These three playbooks are only referenced from Dockerfiles in this repo, so renaming them is a pure internal refactor with no external impact — bundled into one PR because the three rename + Dockerfile update pairs are atomic (the file must match its referenced name for the build to succeed).

The survivor naming convention is `install_.yaml`, matching `install_dev_env.yaml` and `install_docker.yaml` that landed earlier in this effort.

---

Test plan

• Lint passes:

  pre-commit run --all-files

• No stale references remain anywhere in the repo:

  git grep -nE 'autoware_requirements|autoware\.dev_env\.(nvidia|rmw)\b|playbooks/(nvidia|rmw)\.yaml'

  Expect: no matches.

• Bake builds the affected stages end-to-end on amd64:

  cd docker && docker buildx bake --set '*.platform=linux/amd64' ci-base ci-core ci-universe
  docker buildx bake --set '*.platform=linux/amd64' ci-base-cuda ci-universe-cuda

  Expect: each stage completes without `ansible-playbook: ERROR! the playbook ... could not be found` errors. The `base`, `base-cuda-`, `core-`, `universe-*` stages all exercise at least one of the renamed playbooks.

• `health-check-ansible` workflow passes on this PR (runs `install_dev_env` directly on ubuntu-latest — unaffected by the renames, so this is a regression check for the ansible collection layout only).

• `docker-build-and-push` workflow passes on this PR (full bake pipeline across jazzy + humble, amd64 + arm64).

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