ci: run released cuda-core compat on bindings PRs (#2449)

[atiaomar1978-hub]

Summary

• Adds test-cuda-core-linux-64 to PR CI (ci.yml), reusing the existing nightly-cuda-core test mode from CI: nightly-cuda-core + nightly-numba-cuda-mlir + PTDS fix #2283
• Runs when detect-changes flags bindings-related path changes (cuda_bindings, cuda_pathfinder, shared infra, test helpers)
• Uses PR-built pathfinder/bindings wheels from the current run + released cuda-core from PyPI, then executes the released tag's test suite
• Updates the checks aggregator with conditional expectations (success when bindings change, skipped otherwise)
• Adds guardrail unit tests in ci/tools/tests/test_ci_pr_cuda_core_compat.py

Fixes #2449

Test plan

• pytest -v --noconftest ci/tools/tests/test_ci_pr_cuda_core_compat.py (6 passed locally)
• Upstream CI: verify test-cuda-core-linux-64 runs on this PR (touches .github/workflows/ci.yml → shared infra → test_bindings=true)
• Upstream CI: verify checks aggregator passes with the new conditional gate

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[atiaomar1978-hub]

pre-commit.ci fix: Applied ruff format to ci/tools/tests/test_ci_pr_cuda_core_compat.py (pre-commit run https://results.pre-commit.ci/run/github/381173759/1786751697.7FNpRYiJSZCR8Xfq95KQYw reformatted 1 file; autofix is disabled on this repo so pushed manually).

Review follow-up: Also fixed the wheel-download flags — test-pathfinder / test-bindings stay at defaults so nightly-cuda-core can download PR-built artifacts (see commit 0e4c3207ae).

[atiaomar1978-hub]

Cc: @mdboom @kkraus14 — friendly nudge for review when you have a moment.

This PR wires released cuda-core compat into PR CI (#2449): when detect-changes flags bindings-related paths, test-cuda-core-linux-64 runs the existing nightly-cuda-core mode using PR-built pathfinder/bindings wheels + released cuda-core from PyPI, and the checks aggregator expects success only in that case (skipped otherwise).

Since the last update:

• Fixed wheel-download flags so test-pathfinder / test-bindings stay at defaults and the job can fetch PR artifacts (0e4c3207ae)
• Added guardrail tests in ci/tools/tests/test_ci_pr_cuda_core_compat.py (6 passed locally; pre-commit/ruff applied)

Worth a look:

• .github/workflows/ci.yml — new test-cuda-core-linux-64 job + conditional checks gate
• ci/tools/tests/test_ci_pr_cuda_core_compat.py — YAML wiring guardrails vs ci-nightly.yml

Happy to adjust scope or naming if you'd prefer a lighter/different trigger. Thanks!