[REF] Rename SoftDeleteEntity -> SoftDeleteActionTrait

[colemanw]

Overview

2nd attempt to correctly name this trait.

Before

In #22662 it was renamed to SoftDeleteEntity but that's incorrect, this trait is used by action classes not entity classes.

After

Now named SoftDeleteActionTrait for consistency with other action traits, e.g. ArrayQueryActionTrait, DAOActionTrait, CustomValueActionTrait.

[civibot]

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[colemanw]

I put this up against 5.48 because although not technically a regression, it was incorrectly renamed in 5.47, so I think we should get the name right sooner rather than later.

[colemanw]

FYI @braders @demeritcowboy you guys were OK with the last rename.

[demeritcowboy]

Checked universe. Nobody seems to be using the old new name.