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ci: retire Spec Coverage and Engine Split Metric; run the showcase smoke in the Nightly Tiers live tier #51416

Job	Run time
filter	44s
Plan Test Core shards	1m 26s
Build Core	1m 2s
Build UI Deps	36s
Dogfood Regression Gate	30s
Temporal Conformance (live PG + MySQL)	0s
Dogfood Regression Gate (${{ matrix.shard }}/3)	0s
Build Docs	0s
Dogfood Verify CLI	0s
Lint UI	4m 25s
Type Check UI	8m 38s
Build & E2E UI	5m 11s
Test UI (2/16)	11m 42s
Test UI (7/16)	8m 55s
Test UI (8/16)	12m 18s
Test UI (11/16)	12m 34s
Test UI (9/16)	11m 28s
Test UI (4/16)	9m 10s
Test UI (3/16)	7m 57s
Test UI (6/16)	7m 37s
Test UI (1/16)	11m 41s
Test UI (14/16)	11m 26s
Test UI (16/16)	11m 37s
Test UI (12/16)	12m 32s
Test UI (10/16)	9m 15s
Test UI (5/16)	11m 47s
Test UI (15/16)	7m 35s
Test UI (13/16)	8m 57s
Test Core (1/8)	9m 42s
Test Core (7/8)	10m 52s
Test Core (3/8)	1m 26s
Test Core (5/8)	16m 40s
Test Core (6/8)	15m 1s
Test Core (8/8)	1m 28s
Test Core (4/8)	15m 10s
Test Core (2/8)	9m 5s
Test Core	34s
	4h 29m 1s