Update register_runner spec to use `runner-staging` tag
What does this MR do and why?
This E2E test is being removed as part of the Ops Section => End-to-end (e2e) test cleanup an... (gitlab-org/quality&37 - closed) initiative. This spec was identified as a candidate to be removed since all the other tests that require running a pipeline also will need to register a runner anyway. As such, this piece is being tested multiple times across 35 other specs.
Updated: Instead of removing the spec, this spec is being updated to use the runner-staging
tag that will allow it to run in an upcoming runner-staging
environment.
Related to gitlab-org/quality/quality-engineering/team-tasks#1650
MR acceptance checklist
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