Launch invite modal from invite members in top nav

What does this MR do and why?

• Changes the new dropdown from having a link to member page to opening the invite modal instead as per #338506
• Ensures mobile also has the 🤝 emoji

Screenshots or screen recordings

item	before	after
full-screen menu selection		no change
mobile menu selection
invite members click	directs to member page
full experience	Screen_Recording_2023-02-21_at_10.11.56_AM	Screen_Recording_2023-02-21_at_10.07.52_AM

How to set up and validate locally

1. Go to any project or group that you are a maintainer/owner of.
2. Click the ➕ top nav menu option and Invite members.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #338506