ci: split E2E tests into smoke (pre-merge) and full (post-merge) tiers

[ArangoGutierrez]

Summary

• Add e2e-smoke.yaml — runs 2 high-signal tests (default && !rpm + cluster && minimal) on every PR push (~20-25 min, ~$0.60)
• Convert e2e.yaml to full-tier post-merge — runs all remaining labels on push to main only
• Fix broken workflow_run if-conditions that silently skipped all E2E tests
• Add auto-issue creation on post-merge E2E failures

Test plan

• Smoke tests (E2E Smoke) appear in PR checks and run
• Full tests (E2E Full Tests) do NOT appear in PR checks
• After merge: both smoke and full tiers run on main
• On full-tier failure: GitHub issue auto-created with e2e-failure label

Cost impact

• PR pushes: ~$0.60/push (was $0 due to bug — E2E was silently skipped)
• Merges to main: ~$9-13/merge (smoke + full matrix)

Spec: docs/superpowers/specs/2026-03-25-e2e-test-tiering-design.md

[coveralls]

Pull Request Test Coverage Report for Build 23588309028

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 56.346%

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Totals
Change from base Build 23586745948:	0.0%
Covered Lines:	3729
Relevant Lines:	6618

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💛 - Coveralls