[FTR] Implement scrollIntoView util (#165080)

## 📓 Summary

Based on the need for [this
test](https://github.com/elastic/kibana/pull/164493/files#diff-e0bb824023eef20a7b3742da023e25744a6c20406f59ae8400455c579153faeaR262)
to scroll into the element independently of its existence in view, this
PR exposes a new `scrollIntoView` method that replicates the behaviour
of the native [Element
.scrollIntoView](https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollIntoView)
method.

---------

Co-authored-by: Marco Antonio Ghiani <[email protected]>
Co-authored-by: kibanamachine <[email protected]>

test/functional/services/lib/web_element_wrapper/web_element_wrapper.ts

@@ -730,7 +730,32 @@ export class WebElementWrapper {
   }
 
   /**
-   * Scroll the element into view, avoiding the fixed header if necessary
+   * Scroll the element into view
+   *
+   * @param {ScrollIntoViewOptions} scrollIntoViewOptions
+   * @return {Promise<void>}
+   */
+  public scrollIntoView(scrollIntoViewOptions?: ScrollIntoViewOptions) {
+    return this.driver.executeScript<void>(
+      (target: HTMLElement, options: ScrollIntoViewOptions) => target.scrollIntoView(options),
+      this._webElement,
+      scrollIntoViewOptions
+    );
+  }
+
+  /**
+   * Scroll the element into view if it is not already, avoiding the fixed header if necessary
+   * This method is a variation of the scrollIntoView method, where we only scroll into an element
+   * if it is not part of the "scrollable view".
+   * This implies a specific behavior, since the "scrollable view" of the view is identified by
+   * the `document.scrollingElement`, which always results to the html or body tag.
+   *
+   * Use cases:
+   * - An element (a section, a footer) is not visible in the whole page and we need to scroll into it.
+   * - An element is covered by the fixed header and we need to scroll into it ensuring is not covered.
+   *
+   * In case you have a scrollable list smaller that the size of the HTML document and you need
+   * to scroll into an element of that list, prefer using the `.scrollIntoView` method.
    *
    * @nonstandard
    * @return {Promise<void>}