ci(tornado): run the tornado suite when the futures contrib changes

[emmettbutler]

This change updates the suitespec to run the tornado and tracer suites on pull requests that change contrib/futures. This is necessary because #9588 introduced failures (1 2) in those suites that were only discovered post-merge.

Checklist

• Change(s) are motivated and described in the PR description
• Testing strategy is described if automated tests are not included in the PR
• Risks are described (performance impact, potential for breakage, maintainability)
• Change is maintainable (easy to change, telemetry, documentation)
• Library release note guidelines are followed or label changelog/no-changelog is set
• Documentation is included (in-code, generated user docs, public corp docs)
• Backport labels are set (if applicable)
• If this PR changes the public interface, I've notified @DataDog/apm-tees.

Reviewer Checklist

• Title is accurate
• All changes are related to the pull request's stated goal
• Description motivates each change
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Change is maintainable (easy to change, telemetry, documentation)
• Release note makes sense to a user of the library
• Author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[datadog-dd-trace-py-rkomorn]

Datadog Report

Branch report: emmett.butler/tornado-futures-spec
Commit report: 9e4b71d
Test service: dd-trace-py

✅ 0 Failed, 117518 Passed, 59140 Skipped, 4h 10m 21.27s Total duration (5h 39m 37.12s time saved)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.12%. Comparing base (deadfcd) to head (9e4b71d).
Report is 40 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #9656       +/-   ##
===========================================
- Coverage   75.61%   10.12%   -65.50%     
===========================================
  Files        1336     1348       +12     
  Lines      125991   125900       -91     
===========================================
- Hits        95271    12748    -82523     
- Misses      30720   113152    +82432     

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