fix(material-experimental/mdc-progress-bar): run resize observer outside zone

Runs the `ResizeObserver` from the progress bar outside of the `NgZone` so that it doesn't
trigger change detection.

Author: crisbeto

src/material-experimental/mdc-progress-bar/progress-bar.ts

@@ -101,9 +101,11 @@ export class MatProgressBar extends _MatProgressBarMixinBase implements AfterVie
                                         (window as unknown as WithMDCResizeObserver).ResizeObserver;
 
       if (resizeObserverConstructor) {
-        const observer = new resizeObserverConstructor(callback);
-        observer.observe(this._rootElement);
-        return observer;
+        return this._ngZone.runOutsideAngular(() => {
+          const observer = new resizeObserverConstructor(callback);
+          observer.observe(this._rootElement);
+          return observer;
+        });
       }
 
       return null;