fix: handle uv extra== conflict markers in uv_project select() generation

[xangcastle]

When a [dependency-groups] entry acts as a shared group referencing a package that has conflicting versions across other groups, uv encodes the ambiguity in the lock file using synthetic extra == 'group-24-...' markers. These markers are uv-internal routing hints, not real PEP 508 environment markers, so they can't be evaluated as Bazel config_setting targets at build time.

The old code passed them straight into _conditionalize, which tried to create a decide_marker target for each one, causing hub analysis to fail entirely whenever a project used this lock file pattern.

The fix detects these pseudo-markers via _has_extra_marker and treats them as unconditional (//conditions:default), which is correct because the per-venv select() layer already handles group routing; the extra markers are just uv's way of annotating which version belongs to which conflict group in the lock file.

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Changes are visible to end-users: no

Test plan

• New test cases added

[aspect-workflows]

✨ Aspect Workflows Tasks

📅 Thu Jun 11 13:15:21 UTC 2026

❌ 2 failed tasks

• ❌ test (test-e2e-bazel-8) · ⏱ 20.9s · 🐙 GitHub Actions · ☑️ Check
  💬 failed in test · Bazel test failed
• ❌ test (test-e2e-bazel-9) · ⏱ 22.7s · 🐙 GitHub Actions · ☑️ Check
  💬 failed in test · Bazel test failed

✅ 5 successful tasks

• ✅ buildifier · ⏱ 27.6s · 🐙 GitHub Actions · ☑️ Check
  💬 Format complete (clean)
• ✅ gazelle · ⏱ 24.8s · 🐙 GitHub Actions · ☑️ Check
  💬 Gazelle complete (clean)
• ✅ test (test-examples-uv_pip_compile-bazel-8) · ⏱ 28s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (1/1 passed · 1 cached)
• ✅ test (test-root-bazel-8) · ⏱ 36m 53s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (123/123 passed)
• ✅ test (test-root-bazel-9) · ⏱ 37m 10s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (122/122 passed)

🔁 Reproduce

❌ test (test-e2e-bazel-8 · test-e2e-bazel-9)

aspect test -- //...

# without Aspect CLI
bazel test -- //...

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