test: add env tests for VIRTUAL_ENV

[jbedard]

Some tests that would have caught a regression in #980 🤷

Changes are visible to end-users: no

Test plan

• New test cases added

[aspect-workflows]

✨ Aspect Workflows Tasks

📅 Fri Jun 5 22:28:43 UTC 2026

✅ 7 successful tasks

• ✅ buildifier · ⏱ 16.4s · 🐙 GitHub Actions · ☑️ Check
  💬 Format complete (clean)
• ✅ gazelle · ⏱ 23.7s · 🐙 GitHub Actions · ☑️ Check
  💬 Gazelle complete (clean)
• ✅ test (test-e2e-bazel-8) · ⏱ 1m 54s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (139/139 passed)
• ✅ test (test-e2e-bazel-9) · ⏱ 2m 33s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (134/134 passed · 119 cached)
• ✅ test (test-examples-uv_pip_compile-bazel-8) · ⏱ 27.2s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (1/1 passed · 1 cached)
• ✅ test (test-root-bazel-8) · ⏱ 1m 56s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (185/185 passed)
• ✅ test (test-root-bazel-9) · ⏱ 2m 11s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (184/184 passed)

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