Re-enable recorded azure-ai-ml e2e tests blocked by stale live_test_only markers

[Copilot]

This change targets the azure-ai-ml gating gap where several e2e tests were excluded from playback-only PR coverage via @pytest.mark.live_test_only(...) markers that explicitly cited stale recordings / sanitizer migration. The intent is to let already-recorded tests participate in normal playback gating again instead of silently bypassing CI.

• Re-enable playback for stale-recording cases

  • Removed live_test_only markers whose only stated reason was re-recording or sanitizer drift.
  • Affected areas:
    • datastore/e2etests/test_datastore.py
    • environment/e2etests/test_environment.py
    • connection/e2etests/test_connections.py
    • component/e2etests/test_component.py
    • internal/e2etests/test_pipeline_job.py

• Datastore coverage brought back into gate

  • Re-enabled the datastore e2e cases that were most directly relevant to the regression class called out in the issue:
    • test_blob_store
    • test_blob_store_credential_less
    • test_file_store
    • test_credential_less_adls_gen2_store

• Guardrail against regression of the test posture

  • Added tests/test_e2e_recording_marker_audit.py, a lightweight AST-based audit that fails if live_test_only is reintroduced for reasons like:
    • “needs re-recording”
    • “new common sanitizers”
    • “new test proxy sanitizers”

@pytest.mark.live_test_only("Needs re-recording to work with new common sanitizers")
def test_blob_store(...):
    ...

becomes:

def test_blob_store(...):
    ...

• Scope intentionally limited
  • Did not touch skips that still document non-recording reasons (preview-only behavior, service limitations, known product bugs, environment/platform constraints).
  • Did not change test logic or intent; only the gating eligibility and a repo-level audit around stale recording markers.

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