test(feature-processor): Isolate pipeline names to fix flaky integ tests

[lucasjia-aws]

The feature processor to_pipeline integ tests hardcoded fixed pipeline names (pipeline-name-01, pipeline-name-lf-01) and thus shared fixed S3 paths (s3://.../<pipeline_name>/function/payload.pkl). Combined with the asymmetric-signing scheme introduced in PR #5816 (each to_pipeline call generates a fresh ECDSA key pair, overwrites the signed payload, and pins the matching public key into the pipeline env), concurrent CI builds on the same account overwrite each other's payloads. A running execution then verifies a payload signed by a different build's key, producing DeserializationError: "Integrity check for the serialized function or data failed" and pipeline execution status Failed.

Generate unique pipeline names via unique_name_from_base so each test run and build uses an isolated S3 prefix, and restore cleanup_pipeline in the finally blocks to avoid resource leakage.

Issue #, if available:

Description of changes:

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[github-actions]

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PR Review: Isolate feature-processor pipeline names

• Read the PR diff (/tmp/pr.diff)
• Review context (call sites, cleanup_pipeline, unique_name_from_base)
• Assess correctness, tests, and conventions

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This is a well-targeted fix. The root-cause analysis in the description is convincing: hardcoded pipeline names (pipeline-name-01, pipeline-name-lf-01) collide on shared S3 payload paths, and with the per-call ECDSA signing from #5816 concurrent builds clobber each other's signed payloads → DeserializationError. Making each run use unique_name_from_base(...) gives every build an isolated S3 prefix, which addresses the flakiness directly.

Correctness

• unique_name_from_base("pipeline-name-01") yields pipeline-name-01-<ts>-<hex> (≤ 63 chars, only [a-zA-Z0-9-]), which satisfies SageMaker pipeline name constraints. ✅
• The generated pipeline_name local is threaded consistently through to_pipeline, execute, Pipeline(name=...), and the cleanup_pipeline calls in each test. ✅
• Restoring cleanup_pipeline in the finally blocks prevents resource leakage. In the Lake Formation test, placing it outside the if car_data_fg is not None: guard is correct — the pipeline is created regardless of feature-group state, so it should always be cleaned up.
• cleanup_pipeline already swallows ResourceNotFound, so it's safe to call even if to_pipeline never created the pipeline (e.g. early failure).

Minor observations (non-blocking, pre-existing)

• In test_to_pipeline_and_execute / test_schedule_and_event_trigger, the finally block references feature_groups, which is unbound if create_feature_groups(...) raises — that would mask the original error with a NameError. Not introduced by this PR, but worth a follow-up if these tests ever fail during setup.

No new imports beyond unique_name_from_base, which resolves correctly to sagemaker.core.common_utils. The change is minimal, correct, and consistent with the surrounding test conventions.

Verdict: LGTM. ✅