chore: fix some type errors in e2e tests

[SimenB]

Summary

This is far from perfect, but it's better than nothing 🙂 We don't actually typecheck these, so it's solely for local DX as the squigglies are annoying

Test plan

Green CI

[codecov-io]

Codecov Report

Merging #9720 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #9720      +/-   ##
==========================================
+ Coverage   64.93%   64.95%   +0.01%     
==========================================
  Files         288      288              
  Lines       12190    12190              
  Branches     3023     3023              
==========================================
+ Hits         7916     7918       +2     
+ Misses       3636     3635       -1     
+ Partials      638      637       -1     

Impacted Files	Coverage Δ
packages/expect/src/utils.ts	96.22% <0.00%> (+1.25%)	⬆️

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[github-actions]

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