E2E - Fix failures in code suggestions in webide spec

What does this MR do and why?

This change fixes the failure in #431868 (closed)

How to set up and validate locally

You can run the tests against staging.gitlab.com using the gitlab-qa user as the tests do, or by using your own user. If you use gitlab-qa you can skip below to running the tests, otherwise enable the Code Suggestions user preference (see https://docs.gitlab.com/ee/user/project/repository/code_suggestions.html#enable-code-suggestions-for-an-individual-user)

To run the tests, from the qa directory:

export GITLAB_USERNAME=gitlab-qa # or your own username if you have Code Suggestions enabled in your preferences and via the feature flag
export GITLAB_PASSWORD=<from 1Password>
export GITLAB_QA_ACCESS_TOKEN=<from 1Password> # or your own access token
export GITLAB_QA_USER_AGENT=<from 1Password>
bundle install
bundle exec bin/qa Test::Instance::All https://staging.gitlab.com qa/specs/features/ee/browser_ui/3_create/web_ide/code_suggestions_in_web_ide_spec.rb

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.