refactor(profiling): use libdd-profiling's ThinStr

[morrisonlevi]

Description

This replaces the ThinStr defined in this module with the one that is in libdd-profiling instead. Note that the one in libdd-profiling was a copy + refactor of this one, which is why the migration is so easy.

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[datadog-official]

⚠️ Tests

✨ Fix all issues with Cursor

⚠️ Warnings

🧪 1026 Tests failed

    testSearchPhpBinaries from integration.DDTrace\Tests\Integration\PHPInstallerTest (Fix with Cursor)

    testSimplePushAndProcess from laravel-58-test.DDTrace\Tests\Integrations\Laravel\V5_8\QueueTest (Fix with Cursor)

testSimplePushAndProcess from laravel-8x-test.DDTrace\Tests\Integrations\Laravel\V8_x\QueueTest (Datadog) (Fix with Cursor)

DDTrace\Tests\Integrations\Laravel\V8_x\QueueTest::testSimplePushAndProcess
Test code or tested code printed unexpected output: spanLinksTraceId: 698e0477000000003e63a0e4e0aa906b
tid: 698e047700000000
hexProcessTraceId: 3e63a0e4e0aa906b
hexProcessSpanId: 82011110e3bfdd43
processTraceId: 4495613757928149099
processSpanId: 9367787464145493315

phpvfscomposer://tests/vendor/phpunit/phpunit/phpunit:106

View all

ℹ️ Info

❄️ No new flaky tests detected

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 69d9061 | Docs | Datadog PR Page | Was this helpful? Give us feedback!}

[pr-commenter]

Benchmarks [ profiler ]

Benchmark execution time: 2026-02-12 16:48:28

Comparing candidate commit 69d9061 in PR branch levi/thin-str-cleanup with baseline commit cf7ba04 in branch master.

Found 0 performance improvements and 4 performance regressions! Performance is the same for 25 metrics, 7 unstable metrics.

scenario:php-profiler-timeline-memory-control

• 🟥 cpu_user_time [+24.856ms; +30.568ms] or [+4.025%; +4.950%]
• 🟥 execution_time [+27.703ms; +35.616ms] or [+4.312%; +5.543%]

scenario:php-profiler-timeline-memory-with-profiler

• 🟥 execution_time [+22.036ms; +35.781ms] or [+2.177%; +3.535%]

scenario:php-profiler-timeline-memory-with-profiler-and-timeline

• 🟥 execution_time [+28.706ms; +52.046ms] or [+2.223%; +4.031%]

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.11%. Comparing base (cf7ba04) to head (69d9061).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3631   +/-   ##
=======================================
  Coverage   62.11%   62.11%           
=======================================
  Files         141      141           
  Lines       13387    13387           
  Branches     1753     1753           
=======================================
  Hits         8315     8315           
  Misses       4273     4273           
  Partials      799      799           

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