refactor: fix renovate not respecting yarnrc paths
refactor: fix renovate not respecting yarnrc paths

We currently run Renovate from within `yarn renovate`. This results
in Yarn setting `YARN_IGNORE_PATH`. Since Renovate does not execute
in a docker isolated container, the environment variable will leak
through to our `yarn install` when e.g. the components repo is checked
out. Our dev-infra v2+ Yarn install would then always run because with
the environment variable, the vendored Yarn 1.x/ or the default Yarn 1.x
from the github action VM is simply ignored.

angular/dev-infra,angular/dev-infra,angular/dev-infra,angular/dev-infra