Change the Remote Development slipping mention to new PM

What does this MR do and why?

Describe in detail what your merge request does and why.

Change the slipping triage mention to @michelle-chen the PM for Remote Development.

Expected impact & dry-runs

Triage bot mentions should be Michelle now. See https://gitlab.com/gitlab-org/gitlab/-/issues/463416#note_2105198339 for example.

See https://gitlab.com/gitlab-org/quality/triage-ops/-/jobs/7848391581 for dry-run result.

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