chore(ci): add skeleton for nightly E2E matrix workflow #1682
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Description
Add a minimal skeleton for the nightly E2E matrix workflow.
Preserves triggers, job order, and profile matrix; replaces logic with echo placeholders only.
Why do we need it, and what problem does it solve?
Validate triggers, dependencies, and matrix expansion without side effects before introducing real setup/tests/notifications.
What is the expected result?
Workflow runs on schedule/dispatch/PR, expands profiles matrix, and prints stage/profile messages only.
Checklist
Changelog entries