Fix transient error with filtered search lazy author/assignee tokens

What does this MR do?

• Fix transient error with filtered search lazy author/assignee tokens
  • Test is here, https://gitlab.com/gitlab-org/gitlab-ee/blob/43a570dcf5cbd0a98572d5601e9000e906791db0/spec/features/issues/filtered_search/filter_issues_weight_spec.rb#L88

Are there points in the code the reviewer needs to double check?

These changes were used in ce-to-ee-9-3-rc2, https://gitlab.slack.com/archives/C0XM5UU6B/p1497572310860144

Reasoning

I think this happens because of the author and assignee tokens where we swap out the username for an avatar and name

Failing screenshot ❌	Passing screenshot (locally) ✅

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When the test fails, it tries to click on the input, .filtered-search, but the avatars load in and it accidentally clicks a token instead. I marked the spot, the test tried to click 1155.5, 421 which missed

https://gitlab.com/gitlab-org/gitlab-ee/issues/2661

Why was this MR needed?

Transient test failures

As seen in,

• https://gitlab.com/gitlab-org/gitlab-ee/builds/18784705
• https://gitlab.com/gitlab-org/gitlab-ee/builds/18786078

https://gitlab.com/gitlab-org/gitlab-ee/issues/2661

Does this MR meet the acceptance criteria?

• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?