PHP 8.0 deprecated notice caused by the `BP_Groups_Invitation_Manager->run_acceptance_action()` method

[imath]

This is the same trouble I've fixed for #8390. But this one needs to be fixed before PHP 8.0 release (​November 26), so into our 6.4.0 milestone.

BP_Groups_Invitation_Manager->run_acceptance_action() is generating this ​deprecated notice.

[imath]

This patch is also fixing the deprecated notice of the PHPUnit invitations manager asset

[dcavins]

Thanks, @imath! Your patch looks good to me, and definitely won't break anything in BP, where the type is always specified. I can imagine how you could leave the type unspecified, but provide the second argument, anyway. :)

[imath]

In 12792:

Groups: Avoid a PHP 8.0 deprecated notice about optional function arg.

The BP_Groups_Invitation_Manager->run_acceptance_action() method was wrongly using one optional arguments before a required one. As PHP 8.0 no longer accepts this practice, all arguments of the method will be required.

See #8392 (branch 6.0)

[imath]

In 12793:

Groups: Avoid a PHP 8.0 deprecated notice about optional function arg.

The BP_Groups_Invitation_Manager->run_acceptance_action() method was wrongly using one optional arguments before a required one. As PHP 8.0 no longer accepts this practice, all arguments of the method will be required.

Fixes #8392 (trunk)