lint: fix arc-lint breakage on main (suite exclude + skaffold indent + copy.bara dup)

[ConstanzeTU]

Main's lint broke after #68/#83 merged the adaptive_export_loadtest tree. Three fixes:

1. .arclint — exclude the src/e2e_test/adaptive_export_loadtest/suite/ nested go module (aeloadsuite). golangci-lint typecheck-fails on it from the root module (main module (px.dev/pixie) does not contain package …/suite). The sibling tools/loadgen/ was already excluded; this mirrors it.
2. src/e2e_test/adaptive_export_loadtest/skaffold.yaml — reindent the requires: block to indent-sequences: false (yamllint: expected 0/4, was 2/6). yamllint clean now.
3. tools/private/copybara/copy.bara.sky — drop a malformed duplicate list line (md_udtfs/** + shared/manager/BUILD.bazel concatenated behind a comment) that rode in via Restore fork infra (rebased onto current main) — supersedes #72 #83; both paths are already listed correctly above it.

Verified: yamllint clean on skaffold.yaml; the .arclint exclude structurally removes the golangci-lint typecheck failure on the nested module.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between b51c76b and 2aba6c0.

📒 Files selected for processing (3)

• .arclint
• src/e2e_test/adaptive_export_loadtest/skaffold.yaml
• tools/private/copybara/copy.bara.sky

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• Create PR with unit tests
• Commit unit tests in branch fix/arclint-suite-exclude

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