fix: regular package spanning two wheels (azure-core + azure-core-tracing-opentelemetry) is importable

[jbedard]

See #1092 instead

Changes are visible to end-users: yes/no

• Searched for relevant documentation and updated as needed: yes/no
• Breaking change (forces users to change their own code or config): yes/no
• Suggested release notes appear below: yes/no

Test plan

• Covered by existing test cases
• New test cases added
• Manual testing; please provide instructions so we can reproduce:

[aspect-workflows]

✨ Aspect Workflows Tasks

📅 Sat Jun 6 20:02:18 UTC 2026

✅ 7 successful tasks

• ✅ buildifier · ⏱ 19.9s · 🐙 GitHub Actions · ☑️ Check
  💬 Format complete (clean)
• ✅ gazelle · ⏱ 17.8s · 🐙 GitHub Actions · ☑️ Check
  💬 Gazelle complete (clean)
• ✅ test (test-e2e-bazel-8) · ⏱ 2m 8s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (143/143 passed)
• ✅ test (test-e2e-bazel-9) · ⏱ 2m 12s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (138/138 passed)
• ✅ test (test-examples-uv_pip_compile-bazel-8) · ⏱ 27.1s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (1/1 passed · 1 cached)
• ✅ test (test-root-bazel-8) · ⏱ 1m 54s · 🐙 GitHub Actions · ☑️ Check
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• ✅ test (test-root-bazel-9) · ⏱ 2m 13s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (183/183 passed)

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[github-actions]

py_binary startup benchmark

Version	Mean (ms)	Median (ms)	± stddev	vs BCR	vs main	Build (s)
BCR 1.11.5 (baseline)	291.862	290.237	±7.198	—	—	39.07
HEAD main	55.818	55.634	±0.642	-80.9%	—	12.13
This PR	55.943	55.880	±0.593	-80.8%	+0.2%	10.53

Measured with hyperfine --warmup 5 --runs 50 on Linux
Gate: PR vs HEAD main (threshold: 10%). BCR is shown only as a historical baseline.
Build time: cold bazel build //:bench with isolated output base, no disk cache.

sys.path quality

Version	sys.path entries	distinct site-packages roots	duplicate realpaths
BCR 1.11.5 (baseline)	6	1	0
HEAD main	7	2	0
This PR	7	2	0

sys.path quality measured by bench_syspath inside the assembled venv. Duplicate realpaths indicate symlink redundancy; many distinct site-packages roots suggest an inefficient venv layout.