Refactor vendoring to allow validating vendoring is reproducible #7285
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Helps ensure that unsuspecting diffs to the vendored code arent accidentally introduced
What was the end-user or developer problem that led to this PR?
Changes to vendored code are hard to review, and it would be easy for a change to be slipped in that isn't actually from upstream. I deem this to be an attack vector, and one that we don't need to have.
What is your fix for the problem, implemented in this PR?
Make the vendoring process idempotent, so we can (in CI) check that re-vendoring from upstream does not introduce any diffs.
As a part of that, use bundler to do the fetching & unpacking, so we can piggy-back off of its caching & parallel installation & checksum validation.
Make sure the following tasks are checked