[String] fix before/after[Last]() returning the empty string instead of the original one on non-match #38678
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The current behavior is the least useful one. Returning the original string when no match is found is the most sensible behavior. It saves code instead of requiring more.
Typical example is when removing a potential suffix:
$bar = $foo->beforeLast(['.svg', '.png']);
should remove any of these extensions if found, and return the original string otherwise.