Discourage the use of `by.xpath()` locator

Ensure by.xpath locator is not used.

Rule details

According to the Protractor's style guide, using by.xpath is considered a bad practice.

👎 The following patterns are considered warnings:

element(by.xpath("//a[starts-with(@href, 'something')]"));
element.all(by.xpath("//a[starts-with(@href, 'something')]"));

👍 The following patterns are not warnings:

element(by.css("a[href^=something]"));
element.all(by.css("a[href^=something]"));