Rename the pipeline:expedite-master-fixing label to pipeline:expedite

What does this MR do and why?

Closes #385738 (closed), which is step 1 of gitlab-org/ruby/gems/gitlab-dangerfiles#28 (comment 1209372811).

Follow-up of gitlab-org/ruby/gems/gitlab-dangerfiles!135 (comment 1209117246)

Renaming ~"pipeline:expedite-master-fixing" to pipeline:expedite

From Draft to Ready

• Merge the triage-ops counterpart MR first: gitlab-org/quality/triage-ops!1832 (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.