fix(ci): add workaround for Parcel not working with Yarn PnP (#6447)

## What's the problem this PR addresses?

It seems like the issue
(parcel-bundler/parcel#9114) is stuck on
Parcel's side with no interest of it being fixed.

## How did you fix it?

While this is not ideal, that leaves us with two choices: add a
workaround and continue testing Parcel, or remove E2E tests for Parcel
altogether. I chose the former.

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.github/workflows/e2e-parcel-workflow.yml

@@ -29,6 +29,13 @@ jobs:
         yarn init -p
         yarn add -D parcel@nightly lodash @babel/core
 
+        # See https://github.com/parcel-bundler/parcel/issues/9114
+
+        echo "packageExtensions:
+  \"@parcel/fs@*\":
+    dependencies:
+      \"@parcel/core\": '*'" > .yarnrc.yml
+
         # JavaScript
 
         echo "import _ from 'lodash';function printHello() { console.log(_.join(['Hello', 'JS'], ' '))}; printHello();" | tee index.js