DEBUG-2334 test argument squashing into hashes on ruby 2

[p-datadog]

What does this PR do?
Adds test coverage for Ruby 2 pattern of defining a method with an "options" last argument that keyword arguments are squashed into.

Motivation:
Additional test coverage for DI.

Change log entry
None

Additional Notes:

How to test the change?
Unit tests are included.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.29630% with 2 lines in your changes missing coverage. Please review.

Project coverage is 97.77%. Comparing base (e703220) to head (d33df9f).

Files with missing lines	Patch %	Lines
spec/datadog/di/hook_method.rb	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4157      +/-   ##
==========================================
+ Coverage   97.76%   97.77%   +0.01%     
==========================================
  Files        1350     1350              
  Lines       81327    81381      +54     
  Branches     4107     4109       +2     
==========================================
+ Hits        79508    79571      +63     
+ Misses       1819     1810       -9     

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🚨 Try these New Features:

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[pr-commenter]

Benchmarks

Benchmark execution time: 2024-11-25 05:02:26

Comparing candidate commit d33df9f in PR branch di-hash-squash with baseline commit e703220 in branch master.

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