cmd/pyenv-sync: Create major version symlink(s) to fix pyenv support #31768

Job	Run time
syntax	1m 3s
cask audit	2m 59s
tap syntax	6m 33s
formula audit	5m 14s
tests (online)	5m 0s
update-test (Ubuntu)	21s
tests (generic OS)	2m 58s
vendored gems	43s
update-test (macOS)	22s
tests (Ubuntu 24.04)	2m 56s
test default formula (Ubuntu 22.04)	1m 31s
tests (Ubuntu 22.04)	3m 2s
test default formula (Ubuntu 20.04)	2m 49s
tests (Ubuntu 20.04)	4m 15s
test default formula (macOS 13 x86_64)	4m 30s
tests (macOS 13 x86_64)	8m 55s
test default formula (macOS 15 arm64)	1m 34s
tests (macOS 15 arm64)	4m 58s
	59m 43s

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