Group Webhook for Subgroups - Update

Release notes

Problem to solve

We introduced a subgroups webhook in #260419 (closed) that triggers events when subgroups are added or deleted. We also need to emit events when subgroups are edited.

Proposal

Emit subgroup events when:

• Subgroup name is changed
• Subgroup is transferred (Please see #300948 (closed) on how to implement this)
• Path is changed
• Visibility is changed