Secret Management Category label migration

What does this MR do and why?

This is a one-off label migration, see the condition described in Update secrets management from pipeline authori... (#1250 - closed)

Table view:

Before migration	After migration
Category:Secrets Management grouppipeline authoring	Category:Secrets Management grouppipeline security sectionops
Category:Secrets Management Category:Continuous Integration grouppipeline authoring	Category:Secrets Management grouppipeline security
Category:Secrets Management ~"Category:Pipeline Authoring" Category:Pipeline Composition grouppipeline authoring	Category:Secrets Management grouppipeline security

Expected impact & dry-runs

https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/3826876347

Action items

• If adding environment variables for reactive processors, update config/triage-web.yaml and .gitlab/ci/triage-web.yml
• (If applicable) Add documentation to the handbook pages for Triage Operations =>
• (If applicable) Identify the affected groups and how to communicate to them:
  • /cc @person_or_group =>
  • Relevant Slack channels =>
  • Engineering week-in-review