Explicitly don't use a polyfill for vm

[jdbocarsly]

In our build, we are getting a warning about the fact that we don't have a polyfill for one of cypress's subdependencies, which uses the node.js vm function:

warning  in ./node_modules/asn1.js/lib/asn1/api.js

Module not found: Error: Can't resolve 'vm' in '/Users/josh/datalabvue/webapp/node_modules/asn1.js/lib/asn1'

BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
This is no longer the case. Verify if you need this module and configure a polyfill for it.

If you want to include a polyfill, you need to:
	- add a fallback 'resolve.fallback: { "vm": require.resolve("vm-browserify") }'
	- install 'vm-browserify'
If you don't want to include a polyfill, you can use an empty module like this:
	resolve.fallback: { "vm": false }

I don't believe we really need the polyfill since since we haven't had one in for a while and the tests don't seem broken, so this PR just makes that explicit in vue.config.js

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.38%. Comparing base (3230bb2) to head (140c9ab).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #996   +/-   ##
=======================================
  Coverage   68.38%   68.38%           
=======================================
  Files          62       62           
  Lines        3941     3941           
=======================================
  Hits         2695     2695           
  Misses       1246     1246           

[cypress]

datalab    Run #2738

Run Properties:   Passed #2738  •  d1d8635289 ℹ️: Merge 140c9ab750e8b37af59c69647501f25fef043d80 into 3230bb23fa9c9805ab56608a1717...

Project	datalab
Branch Review	jdb/vm-polyfill-fix
Run status	Passed #2738
Run duration	06m 13s
Commit	d1d8635289 ℹ️: Merge 140c9ab750e8b37af59c69647501f25fef043d80 into 3230bb23fa9c9805ab56608a1717...
Committer	Josh Bocarsly
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---

Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	405
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[ml-evs]

polyfills 🤷