how do i remove the client remote desktop app?

The Screen Sharing software is part of macOS, and made available for Finder, Apple Remote Desktop, and other tools.

I wouldn't recommend deleting random parts of macOS. That doesn't always end well, and — if the deletion doesn't cause problems — it's an ongoing effort to keep the client deleted.

If you really want to and are willing to accept that there might be problems, then here are some instructions. Have a backup. There are also instructions in that thread around disabling the Screen Sharing client in the local system settings and at the firewall, and which I would recommend to folks that aren't using the tool and that are concerned about security.)

The vulnerabilities I'm aware of that involve remote screen sharing — and these aren't unique to screen sharing — are due to having the service enabled and remote network access allowed, and either providing a user and password to the remote user for whatever reason, or having a user and password that the remote attackers can guess.

This is a user-to-user forum, where we might occasionally see Apple employees because they are also users, but otherwise no one at Apple will read your posting. And stedman1 already gave the link to communicate with Apple.

If you wish to confirm that ARD is turned off, go to System Preferences -> Sharing and confirm that the box next to "Remote Management" does not have a check mark next to it. You might also want to turn off Remote Login (aka ssh).

Are you using it? if not then forget about it. It can't do harm if it isn't being used.

Uninstall or disable Remote Desktop

You can tell Apple about the vulnerability at: Feedback - Remote Desktop - Apple