Fix missing membershiplog entries and add tests following #30493

[mattwire]

Overview

I missed that creation of the MembershipLog record was hidden in the CRM_Member_BAO_Membership::add() function and it wasn't checked for by any tests so it got missed following #30493.

Before

Missing MembershipLog records when updated via API3 Job.process_membership.

After

MembershipLog records created and tests updated to check for valid MembershipLog records.

Technical Details

Function extracted to create a MembershipLog record. Marked as internal so we can change/refactor further.

Comments

Regression since 5.76

Will add a couple more tests but cannot get tests to run locally so pushing up here draft first.

[civibot]

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