test: remove use of global npm cache and config

[jbedard]

Removing the use of globally installed npm and npm packages. Instead npm+yarn within the test-runner use npm+yarn from package.json (not globals). Tests no longer depend on any --global and use npm+ng installed locally within the temporary test directories.

This might be the last step before being able to run multiple tests concurrently (#23114 was the other big one).

This might be the last one before getting the e2e tests working in bazel (#23074)

EDIT: this has changed to keep globals but use a isolated global cache per invocation, see comment below

Original attempt removing use of --global: 02f7039

[jbedard]

Note this started failing after the recent npm changes. I'll try getting it passing again but let me know if there's any feedback on what's here so far...

[jbedard]

Ok I've updated this PR to significantly less changes then previously...

• each test run uses an isolated folder for the global installations, that global npm bin dir is added to the PATH
• each test run uses only an empty npmrc and prevents the use of ~/.npmrc and the global one
• those are both configured via environment variables, those variables must be propagated to child node processes (e2e tests, npm installs etc)

This no longer removes --global or changes how npm/yarn versions are determined like it original did.

This does NOT prevent the use of the shared global npm database (~/.npm/_cacache/ configured via NPM_CONFIG_CACHE env var) unlike the npm global modules which are isolated. So despite the installed global modules being isolated they shouldn't have to be re-downloaded if the global database is populated. This might change once bazel is used because the bazel test process doesn't have write permission to that global database.

[clydin]

LGTM

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