Update E2E Jira issue id selector to key
What does this MR do and why?
Fixes failing e2e spec: https://gitlab.com/gitlab-org/gitlab/-/issues/454348
Caused by !147347 (merged) and feature flag jira_multiple_project_keys
Fixes failing e2e spec: https://gitlab.com/gitlab-org/gitlab/-/issues/454348
Caused by !147347 (merged) and feature flag jira_multiple_project_keys