fix(rails): disable eager_load in test rails app

[solnic]

WIP

#skip-changelog

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.00%. Comparing base (7755dab) to head (087a05f).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2771      +/-   ##
==========================================
- Coverage   90.28%   89.00%   -1.28%     
==========================================
  Files         131      125       -6     
  Lines        5258     5129     -129     
==========================================
- Hits         4747     4565     -182     
- Misses        511      564      +53     

Components	Coverage Δ
sentry-ruby	97.54% <ø> (-0.06%)	⬇️
sentry-rails	41.05% <ø> (-14.30%)	⬇️
sentry-sidekiq	95.05% <ø> (ø)
sentry-resque	94.44% <ø> (ø)
sentry-delayed_job	94.68% <ø> (ø)
sentry-opentelemetry	99.31% <ø> (ø)
see 10 files with indirect coverage changes

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