Fix method override warning in profiler

[p-datadog]

What does this PR do?

Repairs the warning generated with ruby -w:

/home/w/apps/dd-trace-rb/lib/datadog/profiling.rb:81: warning: method redefined; discarding old allocation_count
/home/w/apps/dd-trace-rb/lib/datadog/profiling.rb:57: warning: previous definition of allocation_count was here

Motivation:

Warning-clean library

Change log entry
Yes: repair ruby -w warning in profiler

Additional Notes:
PRs fixing warnings in other components: #4547, #4548

How to test the change?
Tested manually with:

irb -Ilib -rdatadog/profiliing

[ivoanjo]

👍 I had missed this new warning! Thank you for the fix.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.76%. Comparing base (e239a85) to head (d9d6e4a).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4549      +/-   ##
==========================================
- Coverage   97.77%   97.76%   -0.02%     
==========================================
  Files        1392     1392              
  Lines       84981    84982       +1     
  Branches     4287     4287              
==========================================
- Hits        83093    83079      -14     
- Misses       1888     1903      +15     

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[datadog-datadog-prod-us1]

Datadog Report

Branch report: fix-method-override-warning-in-profiler
Commit report: d9d6e4a
Test service: dd-trace-rb

✅ 0 Failed, 20785 Passed, 1374 Skipped, 3m 15.92s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-03-31 11:14:34

Comparing candidate commit d9d6e4a in PR branch fix-method-override-warning-in-profiler with baseline commit b539362 in branch master.

Found 0 performance improvements and 1 performance regressions! Performance is the same for 30 metrics, 2 unstable metrics.

scenario:tracing - Propagation - Datadog

• 🟥 throughput [-3028.062op/s; -2951.943op/s] or [-9.371%; -9.135%]