build: skip bazel mirror urls when fetching yarn and node (#17606)

Bazel currently always tries to fetch Yarn and Node from the
Bazel mirror server. This is not helpful since the mirror
server usually does not contain artifacts for the versions
we are requesting (this has been the case for a long time).

Bazel currently always tries the mirror first, and falls
back to the official URLs. We should just always use the
official URLs. having the fallback seems to have no benefit
since our other non-bazel jobs rely on the official URLS only too.

Author: devversion

WORKSPACE

@@ -30,11 +30,13 @@ node_repositories(
         "12.9.1-linux_amd64": ("node-v12.9.1-linux-x64.tar.xz", "node-v12.9.1-linux-x64", "680a1263c9f5f91adadcada549f0a9c29f1b26d09658d2b501c334c3f63719e5"),
         "12.9.1-windows_amd64": ("node-v12.9.1-win-x64.zip", "node-v12.9.1-win-x64", "6a4e54bda091bd02dbd8ff1b9f6671e036297da012a53891e3834d4bf4bed297"),
     },
+    node_urls = ["https://nodejs.org/dist/v{version}/{filename}"],
     # For deterministic builds, specify explicit NodeJS and Yarn versions.
     node_version = "12.9.1",
     yarn_repositories = {
         "1.19.1": ("yarn-v1.19.1.tar.gz", "yarn-v1.19.1", "34293da6266f2aae9690d59c2d764056053ff7eebc56b80b8df05010c3da9343"),
     },
+    yarn_urls = ["https://github.com/yarnpkg/yarn/releases/download/v{version}/{filename}"],
     yarn_version = "1.19.1",
 )