Fix notices & php8.2 compatibility on Manage Event Info page

[eileenmcnaughton]

Overview

Fix notices & php8.2 compatibility on Manage Event Info page

Before

Form calling complex non-php8.2 compliant function

After

Form calling simple function - as the fields are loaded by ajax

Technical Details

I tested with a type-specific field & it did save it OK. I also fixed the parent to use the event trait

Comments

[civibot]

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[eileenmcnaughton]

cid only needed for entities with more than one possible contact ID (activities)

[eileenmcnaughton]

test this please

[eileenmcnaughton]

This seems to have fixed a bug with handling file fields as a by product