Add view, click, submission, and dismissal events to /project_members page

The /project_members page is where Invite your colleagues (Learn GitLab) and Invite members :handshake: (Create New) directs to.

The purpose of this issue is to better understand if users are inviting others on this page. We want to add tracking to ensure we understand:

• How many of our new customers are visiting this page from 'Learn Gitlab'
• How many of our new customers are visiting this page from 'Create New > 'Invite members 🤝'
• How many of our new customers are clicking 'Invite Members' on this page
• How many of our new customers are viewing the 'Invite Members' modal
• How many of our new customers are dismissing the 'Invite Members' modal
• How many of our new customers are inviting users from this modal

Add view and 'source' Learn GitLab or Create New

Add submission and dismissal events within 'Invite members' modal

Structured events to be added:

Notes (reference for this issue, not an actual snowplow event property)	category	action	Label	Additional context to capture
✅ Event fires when '/project_members' page loads.	default from page fired on	render	Learn GitLab or plus_menu_dropdown	GitLab User ID and namespace(namespace id)
Event fires when users clicks 'Invite member' on /projects_members page	default from page fired on	click_link_invite_members	projects_side_navigation	GitLab User ID and namespace(namespace id)
Event fires when user dismisses i.e. Clicks X or Cancel	default from page fired on	click_x or click_cancel	projects_side_navigation	GitLab User ID and namespace(namespace id)
Event fires when user 'Invites' a colleague i.e. User clicks Invite	default from page fired on	click_invite	projects_side_navigation	GitLab User ID and namespace(namespace id)

✅ tracking exists