Fix manage event pages to clear caches on save

[eileenmcnaughton]

Overview

Fix manage event pages to clear caches on save

Before

In investigating https://lab.civicrm.org/dev/core/-/issues/5006 I found that if you edit an event to enable self transfer checkout & then test the token it fails because the token is cached. There is code to clear the caches - but not if you call add directly

After

v4 api is called

Technical Details

Note this removes the last direct called to add so with this merged we can copy add back into create & noisily deprecate add

Comments

[civibot]

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[eileenmcnaughton]

test this please

[eileenmcnaughton]

test this please

[composerjk]

It looks like those two failing tests fail when the day before is 29 February since the tests or the membership calculation don't account for leap year and check 2 years from yesterday.

[colemanw]

Agree the test issues are unrelated.