ktlo(ddtrace,contrib): don't use hardcoded FS paths on integration/telemetry tests

[darccio]

What does this PR do?

Fixes Windows CI removing hardcoded Unix-style filesystem paths in TestIntegrationEnabled and TestTelemetryEnabled.

Motivation

Happy CI, happy devs.

Reviewer's Checklist

• Changed code has unit tests for its functionality at or near 100% coverage.
• System-Tests covering this feature have been added and enabled with the va.b.c-dev version tag.
• There is a benchmark for any new code, or changes to existing code.
• If this interacts with the agent in a new way, a system test has been added.
• Add an appropriate team label so this PR gets put in the right place for the release notes.
• Non-trivial go.mod changes, e.g. adding new modules, are reviewed by @DataDog/dd-trace-go-guild.
• For internal contributors, a matching PR should be created to the v2-dev branch and reviewed by @DataDog/apm-go.

Unsure? Have a question? Request a review!

[datadog-datadog-prod-us1]

Datadog Report

Branch report: dario.castane/langplat-289/ktlo-fix-windows-ci
Commit report: 057d8e6
Test service: dd-trace-go

✅ 0 Failed, 5207 Passed, 72 Skipped, 2m 49.23s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-01-27 12:53:39

Comparing candidate commit 8ce68f7 in PR branch dario.castane/langplat-289/ktlo-fix-windows-ci with baseline commit ef2e4e2 in branch main.

Found 2 performance improvements and 0 performance regressions! Performance is the same for 57 metrics, 0 unstable metrics.

scenario:BenchmarkPartialFlushing/Disabled-24

• 🟩 execution_time [-12.166ms; -9.102ms] or [-4.382%; -3.279%]

scenario:BenchmarkPartialFlushing/Enabled-24

• 🟩 execution_time [-11.939ms; -8.206ms] or [-4.228%; -2.906%]

[kakkoyun]

LGTM.

Is there a failing test that's bitten by this already?

[hannahkm]

Is there a failing test that's bitten by this already?

TestTelemetryEnabled and TestIntegrationEnabled were flaky on Windows. Do you think this PR will fix that? @darccio 👀

[darccio]

@hannahkm Yes, this should fix the Windows tests.

@kakkoyun Also yes, the tests running only on main, with some Windows pipelines, were failing due to these hardcoded paths.