Instructions for running integration tests

[p-datadog]

What does this PR do?

Adds instructions for running integration tests locally

Motivation:

Testing of #4272

Change log entry
None

Additional Notes:

How to test the change?
N/A

[github-actions]

Thank you for updating Change log entry section 👏

^{Visited at: 2025-01-09 21:56:15 UTC}

[datadog-datadog-prod-us1]

Datadog Report

Branch report: integration-test-instructions
Commit report: a2791d8
Test service: dd-trace-rb

✅ 0 Failed, 22118 Passed, 1475 Skipped, 6m 1.96s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-01-09 22:32:27

Comparing candidate commit a2791d8 in PR branch integration-test-instructions with baseline commit aff0f7c 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

All modified and coverable lines are covered by tests ✅

Project coverage is 97.72%. Comparing base (aff0f7c) to head (a2791d8).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4260      +/-   ##
==========================================
- Coverage   97.73%   97.72%   -0.02%     
==========================================
  Files        1354     1354              
  Lines       82449    82449              
  Branches     4236     4236              
==========================================
- Hits        80584    80571      -13     
- Misses       1865     1878      +13     

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