Well this was a wild ride. GOOD NEWS..... if you hit CTRL+R...... you get the damn ruler back even without the button! Why they deleted the button, I'll never know. I use the ruler and the protractor DAILY at work -_- I'm an engineer, and drawing on screenshots people shoot me in Teams is like 80% of my life.
SO FOR THE LOVE OF GOD MICROSOFT, BRING IT BACK!!!
Now to see if there is a shortcut for the protractor