[PR] fix: enforce distinct matching in contains and add containsOnce with backtracking [skywalking-infra-e2e]

["wu-sheng (via GitHub)" <gi...@apache.org>]

wu-sheng opened a new pull request, #143:
URL: https://github.com/apache/skywalking-infra-e2e/pull/143

   ## Summary
   
   - Fix a bug in `contains` where one actual item could satisfy multiple expected entries, causing false-positive test results (resolves apache/skywalking#8752). Now each actual item can only be claimed by one expected entry (greedy distinct matching).
   - Add new `containsOnce` keyword that uses backtracking to find an optimal assignment between expected entries and actual items, solving cases where greedy ordering fails.
   - Add 9 new test cases covering both the bug fix and `containsOnce` behavior.
   
   ## Changes
   
   | File | Change |
   |------|--------|
   | `third-party/go/template/exec.go` | Fix `walkContains` distinct matching; add `walkContainsOnce` with backtracking |
   | `third-party/go/template/parse/lex.go` | Add `containsOnce` token |
   | `third-party/go/template/parse/node.go` | Add `ContainsOnceNode` type |
   | `third-party/go/template/parse/parse.go` | Add `containsOnceControl` parser |
   | `internal/components/verifier/verifier_test.go` | 9 new test cases |
   | `docs/en/setup/Configuration-File.md` | Document `contains` and `containsOnce` |
   | `CLAUDE.md` | Add GitHub Actions allow list info |
   
   ## Test plan
   
   - [x] All existing tests pass (no regression)
   - [x] `contains` now fails when 1 actual item tries to satisfy 2+ expected entries
   - [x] `contains` now fails when expected entries exceed actual item count
   - [x] `containsOnce` finds valid assignment via backtracking when greedy fails
   - [x] `containsOnce` fails when not enough distinct actual items
   - [x] `containsOnce` fails when specific expected value is missing
   - [ ] Verify in downstream SkyWalking e2e tests that existing `contains` usage is unaffected
   
   🤖 Generated with [Claude Code](https://claude.com/claude-code)


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Re: [PR] fix: enforce distinct matching in contains and add containsOnce with backtracking [skywalking-infra-e2e]

["wu-sheng (via GitHub)" <gi...@apache.org>]

wu-sheng merged PR #143:
URL: https://github.com/apache/skywalking-infra-e2e/pull/143


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