Many failing test under WordPress 5.3

[imath]

• Most of them involve the line 200 of bp-friends/classes/class-bp-friends-friendship.php : I've found out using do_action_ref_array() instead of do_action() is fixing the failing tests.
• One involves line 45 of tests/phpunit/testcases/members/template.php : WordPress now uses " instead of ' in href attributes of the output of the paginate_links() function.

[imath]

In 12459:

Fix failing tests under WordPress trunk (5.3)

1. Use do_action_ref_array() instead of do_action() to pass the BP_Friends_Friendship object by reference.
2. Adapts the test_bp_has_members_search_pagination_with_spaces() test to WordPress changes in the paginate_links() function.

Fixes #8135