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Delete coveringKey's four drifted figures and point at the --self-test that derives them #27997

Job	Run time
filter	10s
Test Core (5/6)	46s
Test Core (6/6)	1m 12s
Test Core (2/6)	1m 3s
Test Core (4/6)	46s
Test Core (1/6)	5m 15s
Test Core (3/6)	46s
Dogfood Regression Gate	8s
Console Pin Gate	-1s
Temporal Conformance (live PG + MySQL)	-1s
Build Core	-1s
Dogfood Verify CLI	-1s
Dogfood Regression Gate (${{ matrix.shard }}/3)	-1s
Build Docs	-1s
Test Core	15s
	10m 15s