Add new Security Analyzer check for permissions on "Activity Feed" and "User Profile" pages

[daguiler]

• Closes Add new Security Analyzer check for permissions on "Activity Feed" and "User Profile" pages #4948

Summary

This pull request adds this new CheckUserProfilePage class to check the visibility of the user profile page defined in Site Settings > Site Behavior > Default Pages > User Profile Page, according to the following criteria:

Case 1: the selected user profile page is "Activity Feed"

• If the Activity Feed page cannot be found, or is deleted, it returns PASS.
• Otherwise, if the Activity Feed page is public, it returns ALERT.
• Otherwise, if My Profile cannot be found or is deleted, it returns PASS.
• Otherwise, if My Profile is public, it returns ALERT.
• Otherwise, it returns PASS.

Case 2: the selected user profile page is not "Activity Feed"

• If the selected user profile page cannot be found, or is deleted, it returns PASS.
• Otherwise, if the selected user profile page is public, it returns ALERT.
• Otherwise, it returns PASS.

Also, a new base class for audit checks is introduced, and some refactoring to the existing CheckTelerikPresence class is done in order to avoid redundancy.

[mitchelsellers]

This looks great to me! I also updated the description so that the issue was linked for auto-close.

[valadas]

Awesome work, thanks a lot, looks good to me.