feat(npm): support binarySource=install for pnpm

[rarkins]

Changes:

Refactors pnpm tool installation to support binarySource=install

Context:

Part of #13683

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please tick one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[rarkins]

@viceice fails with this permissions problem when testing against https://github.com/renovate-reproductions/monosample and using binarySource=docker:

DEBUG: rawExec err (repository=renovate-reproductions/monosample, branch=renovate/typeorm-0.x)
       "err": {
         "killed": false,
         "code": 1,
         "signal": null,
         "cmd": "docker run --rm --name=renovate_node --label=renovate_child -v \"/tmp/renovate/repos/github/renovate-reproductions/monosample\":\"/tmp/renovate/repos/github/renovate-reproductions/monosample\" -v \"/tmp/renovate/cache\":\"/tmp/renovate/cache\" -e NPM_CONFIG_CACHE -e npm_config_store -e ARTIFACTORY_TOKEN -w \"/tmp/renovate/repos/github/renovate-reproductions/monosample\" docker.io/renovate/node bash -l -c \"install-tool pnpm 6.27.2 && pnpm install --recursive --lockfile-only --ignore-scripts --ignore-pnpmfile\"",
         "stdout": "Installing tool pnpm v6.27.2
/home/ubuntu/.npm-global/bin/pnpm -> /home/ubuntu/.npm-global/lib/node_modules/pnpm/bin/pnpm.cjs
/home/ubuntu/.npm-global/bin/pnpx -> /home/ubuntu/.npm-global/lib/node_modules/pnpm/bin/pnpx.cjs
+ pnpm@6.27.2
added 1 package in 1.578s
6.27.2
",
         "stderr": "npm WARN using --force I sure hope you know what you are doing.
rm: cannot remove '/root/.cache': Permission denied
",
         "message": "Command failed: docker run --rm --name=renovate_node --label=renovate_child -v \"/tmp/renovate/repos/github/renovate-reproductions/monosample\":\"/tmp/renovate/repos/github/renovate-reproductions/monosample\" -v \"/tmp/renovate/cache\":\"/tmp/renovate/cache\" -e NPM_CONFIG_CACHE -e npm_config_store -e ARTIFACTORY_TOKEN -w \"/tmp/renovate/repos/github/renovate-reproductions/monosample\" docker.io/renovate/node bash -l -c \"install-tool pnpm 6.27.2 && pnpm install --recursive --lockfile-only --ignore-scripts --ignore-pnpmfile\"
npm WARN using --force I sure hope you know what you are doing.
rm: cannot remove '/root/.cache': Permission denied
",
         "stack": "Error: Command failed: docker run --rm --name=renovate_node --label=renovate_child -v \"/tmp/renovate/repos/github/renovate-reproductions/monosample\":\"/tmp/renovate/repos/github/renovate-reproductions/monosample\" -v \"/tmp/renovate/cache\":\"/tmp/renovate/cache\" -e NPM_CONFIG_CACHE -e npm_config_store -e ARTIFACTORY_TOKEN -w \"/tmp/renovate/repos/github/renovate-reproductions/monosample\" docker.io/renovate/node bash -l -c \"install-tool pnpm 6.27.2 && pnpm install --recursive --lockfile-only --ignore-scripts --ignore-pnpmfile\"
npm WARN using --force I sure hope you know what you are doing.
rm: cannot remove '/root/.cache': Permission denied

    at ChildProcess.exithandler (node:child_process:397:12)
    at ChildProcess.emit (node:events:390:28)
    at ChildProcess.emit (node:domain:475:12)
    at maybeClose (node:internal/child_process:1064:16)
    at Process.ChildProcess._handle.onexit (node:internal/child_process:301:5)"
       }

[rarkins]

Seems to work now with binarySource=docker

[renovate-release]

🎉 This PR is included in version 31.42.0 🎉

The release is available on:

• GitHub release
• 31.42.0

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