Make Capybara finders less susceptible to timing issues

May help failed build issues such as https://gitlab.com/gitlab-org/gitlab-ce/builds/3115666

Reassigned to @rdavila

See https://robots.thoughtbot.com/write-reliable-asynchronous-integration-tests-with-capybara#find-the-first-matching-element.

/cc: @lbennett

Enabled an automatic merge when the build for 48b5812a succeeds

Added 1 commit:

• f62fb6b7 - Improve specificity of Capybara find selector

mentioned in issue #20957 (closed)

Added 1 commit:

• f18f513d - Prefer find(..., match: :first) to first

Enabled an automatic merge when the build for f18f513d succeeds

Added 1 commit:

• a787b92f - Prefer find(:xpath, ...) to expect(...).to have_xpath

Enabled an automatic merge when the build for a787b92f succeeds

@stanhu conflicts

@connorshea Still some work to do here :)

Closing in favor of gitlab-org/gitlab-ce!5864.

Status changed to closed