test(e2e): Fix nuxt e2e tests

[Lms24]

Pinning Nuxt to 3.15.0 for now since 3.16.0 breaks the e2e tests. Root cause: getsentry/sentry-javascript#15628

No strong opinions but once we or Nuxt fix the 3.16.0 issue, we can also revert this PR if we prefer testing with the latest version again.

#skip-changelog

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.15%. Comparing base (c628975) to head (dec8fac).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #850      +/-   ##
==========================================
+ Coverage   51.09%   51.15%   +0.05%     
==========================================
  Files          53       53              
  Lines        3519     3519              
  Branches      827      816      -11     
==========================================
+ Hits         1798     1800       +2     
- Misses       1594     1718     +124     
+ Partials      127        1     -126     

Flag	Coverage Δ
e2e-tests	80.85% <ø> (+1.41%)	⬆️
unit-tests	49.91% <ø> (ø)

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[andreiborza]

thanks!