t: add test for git refs exists subcommand

Add a test script, `t/t1462-refs-exists.sh`, for the `git refs exists`
command.

This script acts as a simple driver, leveraging the shared test library
created in the preceding commit. It works by overriding the
`$git_show_ref_exists` variable to "git refs exists" and then sourcing the
shared library (`t/show-ref-exists-tests.sh`).

This approach ensures that `git refs exists` is tested against the
entire comprehensive test suite of `git show-ref --exists`, verifying
that it acts as a compatible drop-in replacement.

Mentored-by: Patrick Steinhardt <ps@pks.im>
Mentored-by: shejialuo <shejialuo@gmail.com>
Signed-off-by: Meet Soni <meetsoni3017@gmail.com>
Acked-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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