Simplify `Tap#alias_table`. #26059

Job	Run time
syntax	52s
formula audit	6m 23s
vendored gems	48s
tap syntax	4m 54s
cask audit	2m 25s
docker	5m 32s
test default formula (Ubuntu 22.04)	4m 2s
tests (online)	7m 52s
test default formula (Ubuntu 20.04)	5m 18s
update-test (Ubuntu 22.04)	58s
tests (generic OS)	5m 50s
test default formula (macOS 13 x86_64)	3m 16s
update-test (macOS 13)	49s
tests (Ubuntu 22.04)	6m 34s
test default formula (macOS 14 arm64)	1m 19s
tests (Ubuntu 20.04)	6m 30s
tests (macOS 13 x86_64)	8m 39s
tests (macOS 14 arm64)	6m 15s
	1h 18m 16s

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