Address psych flaky test

[sarahchen6]

What does this PR do?
This PR adds the psych gem to the cucumber loading script and uninstalls psych before the script runs.

Motivation:
The goal of this PR is to address a flaky test caused by the psych gem double loading. @p-datadog includes details in #4130. Per Oleg's findings, the built-in psych gem attempts to override the local/bundle gem. The error is caused when lib/psych/class_loader.rb is loaded for the second time. This solution first uninstalls psych before reinstalling it in the cucumber loading script in order to avoid the double-load error; however, it does not address the original gem load.

Change log entry
No change log entry.

Additional Notes:
This PR addresses the @DataDog/ruby-guild issue here.

How to test the change?
Given the nature of flakiness, I am testing the change through a Green CI and following up to confirm that no more flaky tests related to the psych gem double-loading occur throughout the repo.

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-11-21 19:52:42

Comparing candidate commit 0cdba56 in PR branch sarahchen6/address-psych-flaky-test with baseline commit 7a345da in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 31 metrics, 2 unstable metrics.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.77%. Comparing base (7a345da) to head (5e55750).

Files with missing lines	Patch %	Lines
spec/datadog/core/environment/execution_spec.rb	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4144   +/-   ##
=======================================
  Coverage   97.77%   97.77%           
=======================================
  Files        1350     1350           
  Lines       81322    81322           
  Branches     4107     4107           
=======================================
+ Hits        79515    79516    +1     
+ Misses       1807     1806    -1     

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