Dequarantine CS test but leave out of smoke suite

What does this MR do and why?

Dequarantines the Code Suggestions E2E test.

The test was quarantined when it started failing in the smoke suite, but it was passing in the full suite and passes now in full/smoke pipelines.

Smoke failure investigation ongoing in: #431317

Test runs

I ran the test in the 4 pipelines it's restricted to and they all passed:

• https://ops.gitlab.net/gitlab-org/quality/staging/-/jobs/11867124
• https://ops.gitlab.net/gitlab-org/quality/staging-canary/-/jobs/11867125
• https://ops.gitlab.net/gitlab-org/quality/canary/-/jobs/11867126
• https://ops.gitlab.net/gitlab-org/quality/production/-/jobs/11867128

How to set up and validate locally

It can only be run against Staging or Prod. See instructions in !131604 (merged)

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.