Don't remember why the previous decision that `Code` and `Release` are
non-disable units globally. Since now every unit include `Code` could be
disabled, maybe we should have a new rule that the repo should have at
least one unit. So any unit could be disabled.
Fixes#20960Fixes#7525
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Co-authored-by: delvh <[email protected]>
Co-authored-by: yp05327 <[email protected]>