fix(profiling): fix endpoint profiling for stack v2 [backport 2.9]

[github-actions]

Backport 000ff0a from #10246 to 2.9.

Stack v1 implementation

dd-trace-py/ddtrace/profiling/event.py

Lines 107 to 108 in 9029186

	if endpoint_collection_enabled:
	self.trace_resource_container = span._local_root._resource

Wrong stack v2 implementation

dd-trace-py/ddtrace/internal/datadog/profiling/ddup/_ddup.pyx

Lines 286 to 287 in f42fb50

	if endpoint_collection_enabled:
	root_service_bytes = ensure_binary_or_empty(span._local_root.service)

Found this while working on #10230. Submitting this as a separate PR to merge and backport this ASAP.

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
• The PR description notes risks associated with the change, if any
• Newly-added code is easy to change
• The change follows the library release note guidelines
• The change includes or references documentation updates if necessary
• Backport labels are set (if applicable)

Reviewer Checklist

• Reviewer has checked that all the criteria below are met
• Title is accurate
• All changes are related to the pull request's stated goal
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Newly-added code is easy to change
• Release note makes sense to a user of the library
• If necessary, 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: backport-10246-to-2.9
Commit report: ae5e033
Test service: dd-trace-py

✅ 0 Failed, 84 Passed, 978 Skipped, 28m 7.7s Total duration (41m 38.27s time saved)

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-08-16 15:37:45

Comparing candidate commit ae5e033 in PR branch backport-10246-to-2.9 with baseline commit 709f14f in branch 2.9.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 209 metrics, 9 unstable metrics.