fix(cli): skip files outside the current directory when using --changed

[castarco]

Summary

When running lint, check or format with the flag --changed, ensure that files outside the current directory are filtered out before processing them.

Fixes #1996 .

Test Plan

• Tested it manually at different nested directory levels (including the "root" directory).
• Note that it is difficult to introduce an automated regression test without big changes because the memory filesystem used in tests doesn't allow us to check if the flags we pass to git are correct or not.

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[Conaclos]

Great fix!