Replace deprecated ruby function in e2e tests

[manuelbuil]

Proposed Changes

exists was deprecated since ruby 2.1 and removed in ruby 3.2:
https://www.ruby-lang.org/en/news/2022/12/25/ruby-3-2-0-released/

Types of Changes

Bugfix

Verification

Testing

Linked Issues

User-Facing Change

Further Comments

Thanks @mgfritch

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.79%. Comparing base (1454953) to head (165353f).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10084      +/-   ##
==========================================
- Coverage   47.77%   41.79%   -5.98%     
==========================================
  Files         173      173              
  Lines       14645    14645              
==========================================
- Hits         6996     6121     -875     
- Misses       6317     7362    +1045     
+ Partials     1332     1162     -170     

Flag	Coverage Δ
e2etests	36.38% <ø> (-10.06%)	⬇️
inttests	37.08% <ø> (+17.27%)	⬆️
unittests	11.38% <ø> (ø)

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