Workaround for self-referencing packages

[nicolo-ribaudo]

Q	A
Fixed Issues?
Patch: Bug Fix?
Major: Breaking Change?
Minor: New Feature?
Tests Added + Pass?	Yes
Documentation PR Link
Any Dependency Changes?
License	MIT

The lockfile changes in 039eb27 break the tests of bb558aa. Note that it only breaks our test, any package outside of this monorepo would work without problems.

We can revert this PR after the next release, by bumping @babel/runtime in our lockfile.

I think this is a Yarn bug (it's just a non-supported feature), I posted a description in #12893 (comment):

Are self-references (documented in the first tip here) supposed to work with the node_modules linker?

After merging this PR to main (bb558aa) the tests that here was passing started failing. I can consistently reproduce it with Node.js 13.6 (which doesn't natively implement self-references), running make bootstrap and node test/runtime-integration/src/main-cjs.cjs.

The problem is that packages/babel-runtime has require() calls like

var objectWithoutPropertiesLoose = require("@babel/runtime/helpers/objectWithoutPropertiesLoose");

and this ends up requiring node_modules/@babel/runtime (which is the version downloaded from the registry) rather than packages/babel-runtime.

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