[REF] Migrate Event Cart Setting into the Extension

[seamuslee001]

Overview

This is a small follow on from #17743 which shifts the event cart setting into its' extension

Before

Event Cart setting part of normal Event Settings in core

After

Event Cart Setting in extension

ping @eileenmcnaughton @mattwire

[civibot]

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[eileenmcnaughton]

test this please

[eileenmcnaughton]

So once tests have completed I guess we need to go onto the test box & just check we can still enable this - and perhaps on an upgraded site too

[seamuslee001]

@eileenmcnaughton yes I would say so but I would imagine if it works on the test site the only reason why it might not work on the upgrade is if for some reason the system hasn't installed the extension at which point other parts may break

[eileenmcnaughton]

Added ok-without-test as this moving part need to be done before we can get jiggy with tests

[eileenmcnaughton]

I just r-ran this on a new buildkit site & it works well - I was able to add to cart etc

[eileenmcnaughton]

@seamuslee001 shall we aim to not do too much more on this until the rc is cut & try to get the queue down instead? Quite a few 'has-test' things...