fix(redis): define result in _run_redis_command [backport 2.10]

[github-actions]

Backport 504a347 from #10112 to 2.10.

• This fix resolves an issue in redis utils where a variable may not be declared within a try/catch
• Relates to changes from fix(redis): define result for try/catch #9786, applying same logic to _run_redis_command

File "/lib/python3.12/site-packages/ddtrace/contrib/redis/patch.py", line 152, in _instrumented_execute_command
    return _run_redis_command(ctx=ctx, func=func, args=args, kwargs=kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  
File "lib/python3.12/site-packages/ddtrace/contrib/redis/patch.py", line 136, in _run_redis_command
    rowcount = determine_row_count(redis_command=redis_command, result=result)
                                                                       ^^^^^^
UnboundLocalError: cannot access local variable 'result' where it is not associated with a value

Checklist

• PR author has checked that all the criteria below are met
• The PR description includes an overview of the change
• The PR description articulates the motivation for the change
• The change includes tests OR the PR description describes a testing strategy
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• Newly-added code is easy to change
• The change follows the library release note guidelines
• The change includes or references documentation updates if necessary
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• Reviewer has checked that all the criteria below are met
• Title is accurate
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• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
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• If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
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[datadog-dd-trace-py-rkomorn]

Datadog Report

Branch report: backport-10112-to-2.10
Commit report: f7cb035
Test service: dd-trace-py

✅ 0 Failed, 881 Passed, 12 Skipped, 16m 47.94s Total duration (9.55s time saved)

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-08-13 16:50:29

Comparing candidate commit ccbcf50 in PR branch backport-10112-to-2.10 with baseline commit 63a5a04 in branch 2.10.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 221 metrics, 9 unstable metrics.