[Test] - Fix some tests to call API not BAO

[eileenmcnaughton]

Overview

Towards eliminating direct BAO calls like CRM_Member_BAO_Membership::create

Before

CRM_Member_BAO_Membership::create()

After

$this->callAPISuccess('Membership', 'create', $params);

Technical Details

We don't have a v4 membership api yet - mostly because it needs preliminary cleanup so using v3

Comments

[civibot]

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[seamuslee001]

Looks fine to me merging